F-Secure have published in their Weblog some results related to file types used in targeted attacks.
In 2008 they identified about 1968 targeted attack files. The most popular file type was DOC (Microsoft Word) having 34.55% of the files. The second common was PDF (Adobe Acrobat Reader) 28.61% share. This year, F-Secure have discovered 663 targeted attack files and the most common file type has been PDF with 48.87% of the files. DOC is now second common with 39.22% share.
According to F-Secure explanation for this is mainly cos Adobe Acrobat & Reader have had more vulnerabilities than Microsoft Office applications. Two vulnerabilities are still waiting for patching. Adobe expects to have resolving updates ready by May 12th, 2009.
F-Secure's video about targeted attacks is watchable in YouTube.
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