Firefox 2.x says it wants another plugin to be installed - and that is an "Adobe Reader Plugin" it wants.

This is - by the way - a quite new kind of "drive-by infection" that has become increasingly and alarmingly common.

I think you might switch off the ads altogether and then look what's happening.

I have seen the exactly same advertisement banner both on a game-related web site and on a Poboards-based forum a few months ago, which BOTH triggered the same NOD32 alarm …

So I'm sure this new kind of infection hides within advertisement banners.