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PDF Spam with numbers in the subject

Since Monday I’ve been getting lots of new PDF spam. The subject line ends with a number with 5 to 10 digits in it. The subject line matches the file name of the attachment. The PDF all tout stock spams. The footer of the PDF says the message is from “American Stock Trader Press.” If you try to copy any content from the PDF, you get a warning that a password is needed to copy contents.