: If you have access to a Mac, open the problematic PDF in the Preview app and select File > Export as PDF . This often "refreshes" the font encoding and makes the file readable in other programs like Adobe Acrobat or Illustrator.
| | What It Is | Safe Download Link Type | | :--- | :--- | :--- | | Ghostscript | PDF Processor | ghostscript.com (Official domain) | | TeX Gyre Heros | Helvetica Replacement Font | tug.org/fonts/tex-gyre (Official CTAN) | | Nimbus Sans L | Open Source Helvetica | Search on pkgs.org (Package manager) | | Adobe Acrobat Reader | View PDFs (may still error) | get.adobe.com/reader (Official) | cidfont f1normal font free download link