Windows users, beware offers of free porn and mysterious PDFs.

There's a new virus making the rounds in people's inboxes. Sometimes it offers a link to “free sex movies” and sometimes it offers a link to a PDF.

In the PDF version of the scam, the e-mails are titled “Here you have” or “Just For you.” The body text reads: “This is The Document I told you about, you can find it Here,” followed by a link.

But if you click the link for the PDF or the sex movies, you end up at a malware hosting website. Once the worm gets downloaded on a Windows PC, it accesses a user's Microsoft Outlook account and spreads the e-mail to the user's entire contact list.

The BBC reports NASA, AIG, Disney, Procter & Gamble and Wells Fargo have all been affected.

Protection from the virus can be downloaded at McAfee Security's Labs Blog.

In a post about the virus at ThreatPost.com, tech blogger Dennis Fisher said “it's 2001 all over again,” and likened the virus to the plethora of mass-mailing viruses of the earlier part of the decade.

In 2000, a The ILOVEYOU virus spread via e-mail and attacked tens of millions of Windows computers.