Yes, say goodbye to the PDF spam wave and welcome the FDF stock spam wave!
And yes, you will be able to open it with the regular Acrobat reader! Maybe to bypass filters based on file extension, the spam now is using the file extension .FDF, which is the format used by the data exported from a pdf form fields. The new spam will usually follow the format: -UserEmail.FDF, like GlobalTrading-pbueno.fdf .

Yes…something new to play with…