(no subject)

Over the last week or so, I've been receiving increasing quantities of a very particular type of spam to my cus account. It is apparently addressed to a single other person with a cus account, has a typical short spam title (eg. Stop that hair loss now! or Lose weight fast... or Add 4 to 5 extra inches!!!) followed at the end of the subject line by a short string of jumbled lowercase letters. The body of the message is unviewable in Pine, being apparently in HTML, and always has a length somewhere between 140 and 170 lines. I'm curious as to whether it's actually some kind of virus rather than spam, given the very specific format of it. Anyone here have any ideas? (It's now making up about 95% of my incoming mail.)