Security software firm Intego reports that pirated copies of Adobe Photoshop CS4 may contain a variant of the “trojan horse” malware first reported in copies of Apple iWork ‘09.

The malware is called OSX.Trojan.iServices.B. It affects some copies of Adobe Photoshop that are being distributed through pirate software sites. According to Intego, “The actual Photoshop installer is clean, but the Trojan horse is found in a crack application that serializes the program.”