The parsing engine in F-PROT can be bypassed by manipulating the ZIP method field. It is as easy as opening a ZIP file in an editor and typing a number greater than 15 on your keyboard. This is a four year old vulnerability that they still have not patched.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/76303/TZO-07-2009.txt
Source: https://packetstormsecurity.com/files/76303/F-PROT-ZIP-Method-Evasion.html