What e-mail attachments are most likely malicious?

Though computer users should be wary of all e-mail attachments, there’s one type that’s especially dangerous:

The .RAR file, a proprietary compressed archive format.

While common file types, such as Word document, text and PDF files, make up the greatest numbers of malicious attachments, encrypted .RAR files sent through e-mail contain malware in 97% of cases, according to a recent report by Symantec.

Warn users: Watch out for all e-mail attachments, but pay special attention to .RAR files.

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