Symantec Corporation released its July monthly State of Spam report and one of the more startling trends in the report is the growing use of PDF image spam.

Symantec noted in the report that they had "observed over 25 million messages that were categorized as PDF spam."

Symantec said the PDF spam has been pushed out in two variants thus far. The first one is in a newsletter variant where a spammer makes the attachment resemble an authentic newsletter.

Read the report from Symantec here.