"According to a report from Red Hat, two vulnerabilities in the free PDF reader Xpdf can be exploited via manipulated PDF documents to compromise a victim's system."
"These problems extend to a number of applications that use the Xpdf code, including, poppler, CUPS, gPDF and KPDF."
See:
http://www.h-online.com/security/news/item/Vulnerabilities-in-Xpdf-affect- several-open-source-products-1107088.html