Reading through the stuff, it was probably either hacked, or one of the ads on the site contained malicious software. a lot of those ad bars do all kinds of stuff, like run flash or java programs to download software onto your computer.
"Of the 12 pages we tested on the site over the past 90 days, 4 page(s) resulted in malicious software being downloaded and installed without user consent. The last time Google visited this site was on 2012-10-07, and the last time suspicious content was found on this site was on 2012-10-07."