The bug has been opened on https://bugs.launchpad.net/bugs/122396

"Binary package hint: evince

No idea what the thumbnailer did.
...
DistroRelease: Ubuntu 7.04
ExecutablePath: /usr/bin/evince-thumbnailer
Package: evince 0.8.1-0ubuntu1
PackageArchitecture: amd64
ProcCmdline: evince-thumbnailer -s 128 file:///home/mh21/Desktop/vorlage_sada/da.pdf /tmp/.gnome_thumbnail.PIQQUT
...
.
Thread 1 (process 11291):
#0  0x00002b29d5ae3556 in CairoFont::create (gfxFont=0x74a570, xref=0x6b82f0, lib=0x70abd0, useCIDs=1) at Object.h:291
	refObj = {type = objNone, {booln = 405, intg = 405, real = 2.0009658656570485e-321, string = 0x195, name = 0x195 <Address 0x195 out of bounds>, array = 0x195, 
    dict = 0x195, stream = 0x195, ref = {num = 405, gen = 0}, cmd = 0x195 <Address 0x195 out of bounds>}}
	strObj = {type = objNull, {booln = 0, intg = 0, real = 0, string = 0x0, name = 0x0, array = 0x0, dict = 0x0, stream = 0x0, ref = {num = 0, gen = 0}, cmd = 0x0}}
	tmpFileName = (GooString *) 0x77c4d0
	fileName = <value optimized out>
	tmpFileName2 = <value optimized out>
	dfp = <value optimized out>
	tmpFile = <value optimized out>
	c = <value optimized out>
	n = <value optimized out>
	code = <value optimized out>
	cmap = <value optimized out>
	fontType = fontType1
	name = <value optimized out>
	ff = <value optimized out>
	ff1c = <value optimized out>
	ctu = <value optimized out>
	uBuf = {7398256, 0, 0, 0, 7679824, 0, 3587969053, 11049}
	cairo_font_face = <value optimized out>
	face = <value optimized out>
	codeToGID = <value optimized out>
	codeToGIDLen = 0
	cairo_font_face_key = {unused = 0}
#1  0x00002b29d5ae3c39 in CairoFontEngine::getFont (this=0x709cc0, gfxFont=0x74a570, xref=0x6b82f0) at CairoFontEngine.cc:353
	i = <value optimized out>
	j = <value optimized out>
	ref = {num = 406, gen = 0}
	font = (CairoFont *) 0x0
#2  0x00002b29d5ae54ca in CairoOutputDev::updateFont (this=0x70aad0, state=0x74c0c0) at CairoOutputDev.cc:275
	font_face = <value optimized out>
	matrix = {xx = 3.3061371060132861e-317, yx = 2.344770403471977e-310, xy = 6.9533231071318657e-310, yy = 3.6549553570275397e-317, x0 = 6.9533231071500473e-310, 
  y0 = 4.9406564584124654e-324}
	fontSize = <value optimized out>
	m = <value optimized out>
#3  0x00002b29d5d7c1f1 in Gfx::opShowSpaceText (this=0x70e150, args=0x7fffd88cabe0, numArgs=-706679660) at Gfx.cc:2673
	a = <value optimized out>
	obj = {type = objNone, {booln = 2, intg = 2, real = 9.8813129168249309e-324, string = 0x2, name = 0x2 <Address 0x2 out of bounds>, array = 0x2, dict = 0x2, stream = 0x2, 
    ref = {num = 2, gen = 0}, cmd = 0x2 <Address 0x2 out of bounds>}}
	wMode = <value optimized out>
	i = <value optimized out>
#4  0x00002b29d5d77d95 in Gfx::go (this=0x70e150, topLevel=1) at Gfx.cc:580
	obj = {type = objCmd, {booln = 7849200, intg = 7849200, real = 3.8780200673371124e-317, string = 0x77c4f0, name = 0x77c4f0 "TJ", array = 0x77c4f0, dict = 0x77c4f0, 
    stream = 0x77c4f0, ref = {num = 7849200, gen = 0}, cmd = 0x77c4f0 "TJ"}}
	args = {{type = objArray, {booln = 7807136, intg = 7807136, real = 3.8572376900104462e-317, string = 0x7720a0, name = 0x7720a0 "ð\202k", array = 0x7720a0, 
      dict = 0x7720a0, stream = 0x7720a0, ref = {num = 7807136, gen = 0}, cmd = 0x7720a0 "ð\202k"}}, {type = objNone, {booln = -810889825, intg = -810889825, 
      real = -127.48180000000001, string = 0xc05fded5cfaacd9f, name = 0xc05fded5cfaacd9f <Address 0xc05fded5cfaacd9f out of bounds>, array = 0xc05fded5cfaacd9f, 
      dict = 0xc05fded5cfaacd9f, stream = 0xc05fded5cfaacd9f, ref = {num = -810889825, gen = -1067458859}, cmd = 0xc05fded5cfaacd9f <Address 0xc05fded5cfaacd9f out of bounds>}}, {
    type = objNone, {booln = 0, intg = 0, real = 0, string = 0x0, name = 0x0, array = 0x0, dict = 0x0, stream = 0x0, ref = {num = 0, gen = 0}, cmd = 0x0}}, {type = objNone, {
      booln = 1, intg = 1, real = 4.9406564584124654e-324, string = 0x1, name = 0x1 <Address 0x1 out of bounds>, array = 0x1, dict = 0x1, stream = 0x1, ref = {num = 1, gen = 0}, 
      cmd = 0x1 <Address 0x1 out of bounds>}}, {type = objNone, {booln = -872737354, intg = -872737354, real = -152.68540000000002, string = 0xc06315eecbfb15b6, 
      name = 0xc06315eecbfb15b6 <Address 0xc06315eecbfb15b6 out of bounds>, array = 0xc06315eecbfb15b6, dict = 0xc06315eecbfb15b6, stream = 0xc06315eecbfb15b6, ref = {
        num = -872737354, gen = -1067248146}, cmd = 0xc06315eecbfb15b6 <Address 0xc06315eecbfb15b6 out of bounds>}}, {type = objNone, {booln = -1669883285, intg = -1669883285, 
      real = -752.45439999999996, string = 0xc08783a29c779a6b, name = 0xc08783a29c779a6b <Address 0xc08783a29c779a6b out of bounds>, array = 0xc08783a29c779a6b, 
      dict = 0xc08783a29c779a6b, stream = 0xc08783a29c779a6b, ref = {num = -1669883285, gen = -1064860766}, cmd = 0xc08783a29c779a6b <Address 0xc08783a29c779a6b out of bounds>}}, 
  {type = objNone, {booln = 6691696, intg = 6691696, real = 3.3061371060132861e-317, string = 0x661b70, name = 0x661b70 "ð\202k", array = 0x661b70, dict = 0x661b70, 
      stream = 0x661b70, ref = {num = 6691696, gen = 0}, cmd = 0x661b70 "ð\202k"}}, {type = objNone, {booln = -769723790, intg = -769723790, real = 2.3447673196084833e-310, 
      string = 0x2b29d21ef272, name = 0x2b29d21ef272 <Address 0x2b29d21ef272 out of bounds>, array = 0x2b29d21ef272, dict = 0x2b29d21ef272, stream = 0x2b29d21ef272, ref = {
        num = -769723790, gen = 11049}, cmd = 0x2b29d21ef272 <Address 0x2b29d21ef272 out of bounds>}}}
	numArgs = 1
	i = 2
	lastAbortCheck = 0
	timer = (GooTimer *) 0xffffffff
#5  0x00002b29d5d781d0 in Gfx::display (this=0x70e150, obj=0x7fffd88cad50, topLevel=1) at Gfx.cc:543
	obj2 = {type = objNone, {booln = -661869232, intg = -661869232, real = 6.9533231071500473e-310, string = 0x7fffd88cad50, name = 0x7fffd88cad50 "\b", 
    array = 0x7fffd88cad50, dict = 0x7fffd88cad50, stream = 0x7fffd88cad50, ref = {num = -661869232, gen = 32767}, cmd = 0x7fffd88cad50 "\b"}}
	i = <value optimized out>
#6  0x00002b29d5dbd4c9 in Page::displaySlice (this=0x6d0af0, out=0x70aad0, hDPI=<value optimized out>, vDPI=<value optimized out>, rotate=<value optimized out>, 
    useMediaBox=<value optimized out>, crop=<value optimized out>, sliceX=<value optimized out>, sliceY=0, sliceW=128, sliceH=181, links=0x0, catalog=0x6b8380, abortCheckCbk=0, 
    abortCheckCbkData=0x0, annotDisplayDecideCbk=0, annotDisplayDecideCbkData=0x0) at Page.cc:375
	gfx = (Gfx *) 0x70e150
	obj = {type = objStream, {booln = 7679824, intg = 7679824, real = 3.7943372045071054e-317, string = 0x752f50, name = 0x752f50 "°È\005Ö)+", array = 0x752f50, 
    dict = 0x752f50, stream = 0x752f50, ref = {num = 7679824, gen = 0}, cmd = 0x752f50 "°È\005Ö)+"}}
	annotList = <value optimized out>
	i = <value optimized out>
#7  0x00002b29d5ae1fb3 in poppler_page_render_to_pixbuf (page=0x6572c0, src_x=0, src_y=0, src_width=128, src_height=181, scale=0.21502641549117488, rotation=0, pixbuf=0x6900f0)
    at poppler-page.cc:366
	data = {cairo_data = 0x72cc50 'ÿ' <repeats 200 times>..., surface = 0x70dc00, cairo = 0x70dd10}
	__PRETTY_FUNCTION__ = "void poppler_page_render_to_pixbuf(PopplerPage*, int, int, int, int, double, int, GdkPixbuf*)"
#8  0x0000000000414493 in pdf_document_thumbnails_get_thumbnail (document_thumbnails=<value optimized out>, rc=0x657280, border=0) at ev-poppler.cc:1193
	pdf_document = (PdfDocument *) 0x690000
	poppler_page = (PopplerPage *) 0x6572c0
	pixbuf = (GdkPixbuf *) 0x6900f0
	border_pixbuf = <value optimized out>
	__PRETTY_FUNCTION__ = "GdkPixbuf* pdf_document_thumbnails_get_thumbnail(EvDocumentThumbnails*, EvRenderContext*, gboolean)"
#9  0x0000000000410862 in evince_thumbnail_pngenc_get (document=0x690000, thumbnail=0x7fffd88cca10 "/tmp/.gnome_thumbnail.PIQQUT", size=<value optimized out>)
    at evince-thumbnailer.c:73
	rc = (EvRenderContext *) 0x657280
	width = 595.27570000000014
	height = 841.88980000000004
	pixbuf = <value optimized out>
#10 0x0000000000410b1a in main (argc=5, argv=0x7fffd88cb028) at evince-thumbnailer.c:197
	document = (EvDocument *) 0x690000
	input = <value optimized out>
	output = 0x7fffd88cca10 "/tmp/.gnome_thumbnail.PIQQUT"
	size = 128
	uri = 0x661b70 "ð\202k"
...
I'm sorry, this file was generated from Latex, I suspect the thumbnailer picked it up in the wrong moment while it was still generated? I can attach the complete file, but this is thumbnailed without any problems."