Avast finds PDF exploit invisible to antivirus programs

Criminals have started using an obscure image filter to make malicious PDF files all but invisible to many antivirus programs, Czech security firm Avast Software said. The trick involves hiding a common Adobe Reader exploit inside a PDF (Portable Document Format) file by encoding it with the JBIG2Decode filter, normally used to minimize file sizes when embedding monochrome TIFF (Tagged Image File Format) images inside PDFs.

Source: http://www.infoworld.com/d/security/avast-finds-pdf-exploit-invisible-antivirus-programs-463

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