Uncompressing gif Files that May or May Not be gif's

Is there a way to uncompress something that identifies
itself as a .gif file to try to figure out what it really is?

I have a rich collection of spam that consists of the
usual pathetic biz and pharma-related babel mixed with an equally
obnoxious load of Microsoft virus exploit attempts. On a UNIX
system, the Microsoft exploits mean nothing, especially if you
don't forward them, but the messages have a lot of nondescript
random text fragments in them which probably make the bogofilter
data base I am building less effective.

The goal is to be good at filtering out the commercial
spam and then have a mechanism for detecting the exploit
messages which frequently slip through bogofilter because they
look too much like legitimate traffic.

Martin McCormick WB5AGZ Stillwater, OK
Systems Engineer
OSU Information Technology Department Network Operations Group


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