Got a call that there was a problem viewing emails with attached PDFs today. PDFs were getting mangled up when viewing them on the iPhone (iOS 7.1 and 7.1.1). Did some general testing on the MS Exchange server (2003, btw) and disabled A/V, Firewall and some other things to make sure it wasn’t causing the problem. Outlook and OWA were able to open the PDF without issue so it was targeted at iOS devices it seemed.
The environment for which I took the helpdesk call consists of:

• Microsoft Exchange 2003 Standard (fully patched)
• Symantec Endpoint Small Business (fully updated)
• Windows Server 2003 R2 (fully updated)
• Mixture of iPhones (various iOS levels)

Discovered through an Apple Community Post that there was a bug in iOS (at least we are pointing fingers at iOS anyway).

Workaround

To work around this problem of opening the PDF, take a look at the screenshot below. Download Full Message then download/open the attached PDF.

Hope this helps anyone else out there.