Advertisements that Google considers badware

If you run affiliate ads or ads from advertising networks, you usually put the ads on the page by inserting iframe links or JavaScript into the code of your pages. The ads are retrieved from the third party sites only when your page is loaded into a visitor's browser.

There are a few advertising networks that do things in their code that StopBadware and Google consider badware behavior. There are also ad networks that fail to properly screen the ads submitted by advertisers for distribution, so sometimes malicious ads get into their inventory. Make a list of the advertisers you are affiliated with. Do a web search on them or ask about them in a forum where there are people who might be up-to-date with which advertisers (if any) are currently problematic. An example of a web search that I have found useful is:

advertiser badware OR StopBadware OR malware OR virus

Bad ads can slip into even the big ad networks. DoubleClick clients got hit in 2007.

An increasing amount of advertising is being served in Flash .swf files. These files can be flagged as badware, too.