Part of the Chinese character cannot be rendered

Attach (recommended) or Link to PDF file here: pdf link

Configuration:

• Web browser and its version: chrome 86.0.4240.193
• Operating system and its version: macOS 10.13.6
• PDF.js version: 2.5.207
• Is a browser extension: -

Steps to reproduce the problem:

1. use the getDocument api to render the pdf
2. getDocument options:

{  
    url: 'https://zhihu-live.zhimg.com/pdf/20201112/origin/ac8b5907e1cf5ee7cada8650bbf1082d.pdf' 
    cMapUrl: 'https://unpkg.com/browse/pdfjs-dist@2.6.347/cmaps/',
    cMapPacked: true
}

What is the expected behavior? (add screenshot) expect render normal

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): no

[YeeJone]

I found a strange phenomenon: when cMapUrl is a CDN address, there will be problems, like this:

That suggests that the issue could be that the CDN is returning incorrect/malformed data, which we unfortunately cannot do anything about here since the CDN is provided by a third-party. Another possible explanation could be that you’re using a CORS policy which somehow breaks the CMap-requests, and in that case you could maybe try using a custom CMapReaderFactory to work-around that.

yep, I noticed that too
https://unpkg.com/browse/pdfjs-dist@2.6.347/cmaps/GBK-EUC-H.bcmap This url actually returned an HTML, not a bCmap resource… : )💥

So the solution is to replace cMapUrl with https://cdn.jsdelivr.net/npm/pdfjs-dist@2.5.207/cmaps/ Thank you very much for your help！！😁 😬

[Snuffleupagus]

I found a strange phenomenon: when cMapUrl is a CDN address, there will be problems, like this:

That suggests that the issue could be that the CDN is returning incorrect/malformed data, which we unfortunately cannot do anything about here since the CDN is provided by a third-party. Another possible explanation could be that you’re using a CORS policy which somehow breaks the CMap-requests, and in that case you could maybe try using a custom CMapReaderFactory to work-around that.