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I've received some stock spam that uses the FDF attachment, which I wasn't familiar with. This PDF based attachment type might need to be added to corporate email attachment blocking lists. Stock Spam - Now uses FDF attachment types http://www.f-secure.com/weblog/archives/archive-082007.html#00001246 Quote: After image spam, PDF spam, DOC and XLS spam we're now seeing FDF spam. FDF apparently stands for Forms Data Format. This is a form file that's read by Acrobat and other PDF readers. the content of the file - suprise, surprise: stock spam.