[Esd-l] New compressed file extension

John D. Hardin jhardin at impsec.org
Fri Jan 7 20:36:13 PST 2005

On Fri, 7 Jan 2005, Simon Matthews wrote:

> I don't suppose there is any file magic that could be used to
> detect different forms of archives, rather than relying on a
> possibly incomplete list of extensions?

Yes, the first four bytes of a ZIP file are magic.

I have an idea for how to scan an attachment for the magic and do
zipfile scanning regardless of what the MIME header says it is, but
haven't started working on it yet.

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