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dindonufin ago

Zip files are safe. Do not execute anything (OBVIOUSLY). Right click and open with compression software. Beware .html files as they can contain malicious javascript/flash. Be sure to open them in a browser with javascript/flash disabled. Someone mentioned in another comment to use sandboxie. That can also be useful. NEVER use internet explorer.

All of that said, you can still be hit with malware or otherwise be tracked just by clicking on an external news article here.

dindonufin ago

I'm not sure what decomposer engine is, but it sounds like some sort of malware scanning for email.

Jefiakra ago

Basically. Was a vulnerability in Symantec in which maliciously crafted archives (including Zip files) could exploit Symantec's archive extractor, and execute shellcode. If I recall, there's also a whole version of Rar (Rar 3, maybe), which can contain arbitrary code as part of the spec. Zip is a very simple format, so you're probably safe, but it's worth knowing that there are exceptions out there.