This bug come from https://bugs.kde.org/show_bug.cgi?id=187878

original bug report:
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Version:           0.8.1 (using 4.2.1 (KDE 4.2.1), Arch Linux)
Compiler:          gcc
OS:                Linux (i686) release 2.6.28-ARCH

way to reproduce the bug:
* go to the archlinux wiki (I use konqueror) and save one page (a random topic)
as a .pdf
* open it in okular
* you will notice that the document is corrupted, for example there are no
occurrence of the "u" letter
* open the same document with anoter viewer (I used the GNOME evince)
* the document looks perfect (eg: the "u" letter is normally present)

[federico@archlinux-laptop ~]$ pacman -Si poppler
Repository     : extra                           
Nome           : poppler                         
Versione       : 0.10.2-1                        
URL            : http://poppler.freedesktop.org/ 
Licenze        : GPL  custom                     
Gruppi         : Nessuno                         
Fornisce       : Nessuno                         
Dipende da     : libjpeg  gcc-libs>=4.3.2  cairo>=1.8.6  
                 libxml2>=2.6.32-5  fontconfig>=2.6.0    
Dip. opzionali : Nessuno                                 
Conflitti con  : Nessuno
Sostituisce    : Nessuno
Dimensione pkg : 4939,49 K
Kb richiesti   : 15564,00 K
Autore         : Jan de Groot <jgc@archlinux.org>
Architettura   : i686
Creato il      : ven 26 dic 2008 17:55:39 CET
Somma MD5      : 46f6ce5af8af06e56452a47e3fe59d83
Descrizione    : PDF rendering library based on xpdf 3.0

[federico@archlinux-laptop ~]$ pacman -Si poppler-qt
Repository     : extra
Nome           : poppler-qt
Versione       : 0.10.2-1
URL            : http://poppler.freedesktop.org/
Licenze        : GPL
Gruppi         : Nessuno
Fornisce       : Nessuno
Dipende da     : qt>=4.4.3  poppler>=0.10.2
Dip. opzionali : Nessuno
Conflitti con  : Nessuno
Sostituisce    : Nessuno
Dimensione pkg : 206,07 K
Kb richiesti   : 656,00 K
Autore         : Jan de Groot <jgc@archlinux.org>
Architettura   : i686
Creato il      : ven 26 dic 2008 18:00:05 CET
Somma MD5      : 7146f321871574f79bceda90b867c992
Descrizione    : Poppler Qt bindings

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note:
The bug also occurrs with with both poppler and poppler-qt to the 0.10.5-1 version

An example document is attached


Best regards Federico Muciaccia