Some text disappeared in this PDF.

[cmh1996]

Attach (recommended) or Link to PDF file here:
1.pdf.lin (1).pdf

Configuration:

• Web browser and its version: FireFox 84.0
• Operating system and its version: macOS 10.15.7
• PDF.js version: 2.7.262
• Is a browser extension: No

Steps to reproduce the problem:

1. Open the PDF with pdf.js.
2. Found the text of this PDF disappeared.

What is the expected behavior? (add screenshot)

What went wrong? (add screenshot)

Link to a viewer (if hosted on a site other than mozilla.github.io/pdf.js or as Firefox/Chrome extension):

[Snuffleupagus]

Your PDF document is corrupt, since one of the fonts is missing necessary data, as indicated by the errors in your screen-shot.
While we perhaps should handle the actual error better, please note that Adobe Reader (i.e. the PDF reference implementation) renders that document in the same way as the PDF.js library does.