The bug has been opened on https://bugs.launchpad.net/ubuntu/+source/evince/+bug/123116

"Binary package hint: evince

I moved several pdf files to a directory ; some were already there (copies) so they were overridden

The thumbnailer went into action and crashed
...
libpoppler1 0.5.9-0ubuntu1
...
.
Thread 1 (process 12089):
#0  Object::fetch (this=0x7c8b482824448b4c, xref=0x30244c8b4cc38949, obj=0x7fff6b20e870) at Object.cc:106
No locals.
#1  0x00002b3b47e635bb in Form (this=0x6bb660, xrefA=0x6bbad0, acroForm=0x6bbc20) at Form.cc:1042
No locals.
#2  0x00002b3b47e5a31c in Catalog (this=0x6bbb70, xrefA=<value optimized out>) at Catalog.cc:59
No locals.
#3  0x00002b3b47eb321a in PDFDoc::setup (this=0x6bb6e0, ownerPassword=0x0, userPassword=0x0) at PDFDoc.cc:205
No locals.
#4  0x00002b3b47eb340f in PDFDoc (this=0x6bb6e0, fileNameA=<value optimized out>, ownerPassword=0x0, userPassword=0x0, guiDataA=<value optimized out>)
    at PDFDoc.cc:102
No locals.
#5  0x00002b3b41c3d4e8 in poppler_document_new_from_file (uri=<value optimized out>, password=0x0, error=0x7fff6b20ea48) at poppler-document.cc:143
	newDoc = (PDFDoc *) 0x6bb6e0
	filename_g = (GooString *) 0x6bb630
	password_g = (GooString *) 0x0
	filename = <value optimized out>
#6  0x00000000004162d9 in pdf_document_load (document=<value optimized out>, 
    uri=0x668290 "file:///home/leroutier/Desktop/Talks/fullcircle-issue01-english.pdf", error=0x7fff6b20eae8)
    at /build/buildd/evince-0.9.1/./backend/pdf/ev-poppler.cc:265
	poppler_error = (GError *) 0x0
#7  0x0000000000412db0 in ev_document_factory_get_document (uri=0x30244c8b4cc38949 <Address 0x30244c8b4cc38949 out of bounds>, error=0x7fff6b20eae8)
    at /build/buildd/evince-0.9.1/./libdocument/ev-document-factory.c:347
	document = (EvDocument *) 0x698c00
	result = <value optimized out>
	compression = EV_COMPRESSION_NONE
	uri_unc = (gchar *) 0x0
#8  0x0000000000411be2 in main (argc=5, argv=0x7fff6b20ebf8) at /build/buildd/evince-0.9.1/./thumbnailer/evince-thumbnailer.c:48
	error = (GError *) 0x0
	document = <value optimized out>
	input = 0x7fff6b20fc14 "file:///home/leroutier/Desktop/Talks/fullcircle-issue01-english.pdf"
	output = 0x7fff6b20fc58 "/tmp/.gnome_thumbnail.CH50UT"
	size = 128
	uri = 0x7c8b482824448b4c <Address 0x7c8b482824448b4c out of bounds>
..."