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Originally Posted by llama64
It's possible that there is an exploit in the format that allows for execution of code upon decompression. I believe there was a similar issue with an image format (jpeg?) on windows a year or two ago.
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I believe the issue with jpegs was IF someone was already infected with a worm that alters the way the operating system handles jpegs, then it is possible for a jpeg to "execute" malicious code.
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If one is really curious, just open it up in a virtualized instance of something like Ubuntu linux.
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Great advice for anything fishy...Vmware Server is a great, free product. You can load up a guest OS, run some fishy attachment, whatever. If it is a virus, hit the "Revert" button to the previous state, before downloading the virus.