Some vulnerabilities have been reported in KDE KPDF, which can be exploited by malicious people to cause a DoS (Denial of Service) and potentially to compromise a user's system.

The vulnerabilities are caused due to the use of vulnerable Xpdf code.

For more information:
SA34291

Solution
Use another PDF viewer (e.g. Okular).
Original Advisory
RHSA-2009-0431:
http://rhn.redhat.com/errata/RHSA-2009-0431.html

Other references
Further details available to Secunia VIM customers

Deep Links
Links available to Secunia VIM customers