It's an F/P and it isn't at the same time.

Your AV is correctly detecting the malicious code that's posted in the thread, but doesn't seem able to determine the difference between safely posted, and not.

http://www.stopforumspam.com/forum/p417 … 3A31#p4173

In this case, the code was posted safely, so is harmless unless you actually run it yourself (which would require a little more than viewing the thread).

Your AV hasn't done anything wrong here - it's just being over-protective (always better than being under-protective)