ARTICLE"Google's advertising policy requires that the Web site address displayed in the ad must match the domain of the landing page for that ad in order to ensure that users clearly understand the destination Web site being advertised," the spokesperson said in an e-mailed statement. "We use a combination of manual and automated processes to detect and enforce these policies."
But it doesn't say, "no malvertising". i think there's too much money at stake for google to ban ALL malvertising.