I am noticed this exploit on last week and send the letter to admin. No answer was receved, and site is still infected.
It tries to execute [somerandomname].pdf. On most of pages (but site could have the same ads on every page, so it's not matter anything). As my Opera have all such autoruns disabled, it simply suggest to download it for me. When I downloaded it, yes, my scanner immediately said "it is a virus!" So I, personally, simply denied download every time after that.
Update: Checked it right now. "auto-pdf" is gone. But no any explanations posted. As I installed new update of Opera, it may be simply false negative. Can anyone check it too?