DRUG COMPANY Pfizer might have hit upon a new way to push its pills, or maybe it’s merely been hacked.

San Francisco security firm Support Intelligence told Wired that an unknown number of Pfizer’s computers appear to have been zombied and are slinging spam emails far and wide advertising Viagra, a Pfizer product, along with Cialis, a competing drug, and the usual assortment of penile extensions, fake watches, and penny stock scams.

Rick Wesson, CEO of Support Intelligence, said this has been going on for six months. He’s collected 600 spam emails to prove it and adds that 138 Pfizer IP addresses have been blacklisted by various spam-fighting groups.

Support Intelligence has tried to alert Pfizer to the problem several times, but apparently its warnings have been ignored.

Or, can it be that Pfizer has rolled out an innovative marketing campaign, call it covert deniable viral guerilla marketing?

More information [Wired]