UserAgent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/70.0.3538.102 Safari/537.36

Example URL:

Steps to reproduce the problem:
1. Open attached PDF file
2. All Chinese text is missing

What is the expected behavior?
Chinese text should be visible.

What went wrong?
Font probably isn't embedded in the PDF. Still, a fallback font should be used. Other viewers/browsers do this (Edge, Firefox).

Also, pdf.js running inside Chrome is able to render the text (so some fallback font with the needed characters is available to Chrome). Try the attachment here: https://mozilla.github.io/pdf.js/web/viewer.html

Does it occur on multiple sites: Yes

Is it a problem with a plugin? N/A 

Did this work before? N/A 

Does this work in other browsers? Yes

Chrome version: 70.0.3538.102  Channel: stable
OS Version: 10.0
Flash Version: 

Issue is probably with pdfium upstream, but I don't know the correct version, or how to reproduce with just pdfium, so I decided to report here, where it can easily be reproduced.

It affects Android similarly where pdfium is used (Google Drive PDF viewer, Google PDF viewer, the Android PdfRenderer, Android printing framework, etc).
 

Deleted: TEST.pdf 3.7 KB

TEST.pdf 3.7 KB Download