Spam weirdness

So I get some spam with the subject line “An IE 6 patch” and a file attachment. I’m thinking stupid Windows virus, but I’m a bit curious, as I thought I had my filters set up to remove anything containing Windows executable code. So I open it, and it’s a picture of a naked woman lying in an empty bathtub. Her legs are dangling over the side of the bathtub, and she’s wearing nipple clamps.

No message, no ad, no URL, no phone number, nothing but a small JPEG.

Is there some Windows virus out there that picks random porn off people’s hard drives and e-mails it out to everyone in their address book?