This has been a rough quarter for Office vulnerabilities… there seems to be a pattern, Microsoft patch day, then…. zero-day exploit within a week for an Office component. First Word, then Excel and now this month our vulnerable app is Powerpoint. The Security Fix has some coverage and notes the pattern – the likely motivation is so that there will be more time to exploit before the vulnerability is patched. The moral of the story is to be suspicious of Powerpoint attachments/files from untrusted sources. i.e. verify that you should be receiving an attachment even from KNOWN sources.