I receive quite a few legitimate pdf attachments - half of them are pdf type, the
other half is octet-string
(but they are usually A4 paper size)

Wolfgang Hamann


>> >Here's a new style of PDF spam (recipient email address is munged):

>>
>> [snip]
>>
>> > - uses "application/octet-stream" instead of "application/pdf"
>> > as the Content-Type

>>
>> From your sample:
>>
>> Content-Type: application/octet-stream; name="Message.pdf"
>>
>> You could match on the "application/octet-steam" and the file
>> extension being ".pdf".
>>
>> Regards,
>> -sm
>>
>>