Another thing to watch out for.

The latest spam gimmick is to send you an e-mail message from a legitimate-sounding e-mail address but no subject line. The message includes an attached PDF and that’s all.

The only way to see what the message is about is to open the PDF.

I’ve gotten four of these in the last 24 hours and have managed to resist the temptation. I don’t know if a PDF can contain viruses — although I tend to think that it can’t — but I simply can’t be bothered opening attachments of any sort from people I don’t know.

Keep an eye out for this one. If you do happen to open one, use the Comments link or form to let us know what they’re selling this time.