As per the issue description mentioned above, you are getting error when trying to open a pdf attachment in Outlook, is that correct?
Are you previewing the pdf file in Outlook using Preview option in Outlook or opening it in Acrobat?
Check if an update is available for Acrobat using "Check for updates" option under Help menu, reboot the machine and check.
To download updates manually, visit this link:; Overview — Release Notes for Legacy Acrobat Products
You may also visit the following forum threads discussing the similar issue:
Well, both don't work, it says this file is corrupted and cannot be previewed. This happens only with this file. I was considering something in the file header... because other files can be opened. This one can be opened via webmail and also via cellphone as I mentioned, so there is something during the generating that does not alloe Adober Reader or Standard to open this file.
Would it be possible if you can share the pdf file you are working with to replicate the issue at our end? To share the file here in the forums, refer to the steps given here: How to share a file using Adobe Document Cloud