In their never ending quest to evade our filters the spammers have now started using FDF attachments to spread their message. I’ll admit I had to look up what an FDF file was. It stands for Forms Document Format. This file format can be viewed using Acrobat reader the way a PDF file would.
Apparently the spammers must have not got the traction with PDF spam they had hoped. It is possible that the countermeasures are working well for PDF spam. I saw a post recently talking about a Spam Assassin solution that works with OCR (Optical Character Recognition) technology to read PDF’s and score them as a normal text email.
There must still be money out there for the spammers to make.
–Chris
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