Anti-Malvertising.com offers tips for Web Publishers and users on how to protect their computers and websites from malware. The site’s ad networks and exchanges may have significantly different standards for the prevention and detection of malware. Be aware that malware can be disguised as antivirus/antispyware software in order to trick people into buying or downloading it. Always research a company’s reputation before downloading its software or visiting its website, and be wary of unexpected warnings from products you haven’t installed yourself.”]
Source: https://security.googleblog.com/2009/10/protecting-users-and-ads-from-malware.html