This fake fax spam is meant to contain malware, but in this particular case is being sent out with a corrupt attachment:
Date: Fri, 28 Jun 2013 09:41:52 -0500 [10:41:52 EDT]
From: jConnect [message@inbound.j2.com]
Subject: jConnect fax from "697-377-6967" - 28 page(s), Caller-ID: 697-377-6967
Fax Message[Caller-ID: 697-377-6967] You have received a 28 page(s) fax at 2012-12-17