Iframe busters or stub files are commonly utilized by third-party vendors in conjunction with Flash creatives such as media rich advertisements that are served within an ad slot implemented in an iframe. You may have noticed visitors to your website visit a page on your website that does not exist ending in /eyeblaster/addineyev2.html, /doubleclick/DARTIframe.html, /atlas/atlas_rm.htm, and many others. These pages often results in a 404 error.
If this is the case, you may need to upload an “iframe buster” into the root of your website’s server at the following location: www.example.com/vendorname. Iframe busters or stub files are provided by 3rd-party ad servers and media creative vendors.