Improper parsing of the PDF structure by various F-Secure products leads to evasion of detection of malicious PDF documents at scantime and runtime.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/82291/GSEC-48-2009.txt
Source: https://packetstormsecurity.com/files/82291/F-Secure-Generic-PDF-Bypass.html