Mac Mail (iCloud) - PDF 'Corruption' Issue

[oldmacs]

Hi there,

I have a family member using Mac Mail (M4 MacBook Air, MacOS Sequoia) with an iCloud Mail account - some PDFs attached to received emails will not open properly.

• (Mac Mail) Opening into Acrobat (default) brings opens some of the PDF, but missing the body and Acrobat Displays an Error.
• (Mac Mail) Opening with Preview results in a mainly blacked out document with a few sections of text.
• (Mail Mail) Quick look has the same results as preview.
• (iCloud Mail Online) - the PDF downloads and opens absolutely fine in either Acrobat or Preview.
• (Outlook New) - The PDF previews and opens absolutely fine as a quick look, Acrobat or Preview.

Forwarding the email in Mac Mail results in the same issues when opening the forwarded attachment in Outlook & iCloud Mail Online.

Have tried synchronising the folder, rebuilding the mailbox, quitting mail, restarting etc with no difference.

Has anyone seen this behaviour or could suggest a fix?

 

[FreakinEurekan]

Certainly behaving like a bug. What version of macOS are they on? Update would be my first step.

If that doesn’t sort it, here are some t/s options.

• Boot into Safe Mode, see if the problem goes away
• Do a clean install of macOS on a separate Volume
  • If the issue isn’t present there, it’s likely caused by some other installed software on the original volume. You could troubleshoot the original or move over to this new install & delete the original once that’s done.

 

[NoBoMac]

Maybe I missed it, but another test to try: Mac Mail > Save to Downloads the PDF. Open via Preview via Finder?

Based on other results, looks like PDF is coming over fine, just that something is getting messed up when opening in-place. Believe a temp copy is saved to disk and that is being opened when viewing from Mail, so Save to Downloads should give problems as well if getting corrupted in general.