Troj/DownLd-ABF is an advertising related downloader Trojan for the Windows platform.

Troj/DownLd-ABF infects HTML files stored on the local computer with IFRAME links to advertising related HTML pages.

Troj/DownLd-ABF can arrive as a result of web browsing. Visiting certain web sites may initiate the download process.

More information can be found at this Sophos page.