If you can give us some information on the offending ad we'll be extremely happy to send it to the ad people so they can send it to the ad network, so they can do whatever it is they do with advertisers that embed malware in their ads.
I'm not doubting that you had a real issue, but we have two problems with suspect ads: 1) Insufficient info to identify which ad is problematic, and 2) firewalls that like to identify ads as being malware when they are in fact nothing of the kind. That's a marketing ploy of the makers of the malware detectors - makes their product look like it's doing something useful and important.
Anyway, let us know whatever you can to help isolate the offender.
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