For the last year one of the more annoying developments in mass spamming has been a technique where the spam is embedded in an image. With this method it is much more difficult for spam filters to determine if an email with a image is spam or legitimate. Over time developments were made to counteract this technique by performing optical character recognition on the attached images to determine the text encoded in them. This would allow the spam filter to then analyze the text in the image and determine if it was spam. This week a new technique started being used in which spam image is embedded in an attached PDF document as shown below.