Attach (recommended) or Link to PDF file here:
[测试文件.pdf](https://github.com/mozilla/pdf.js/files/7147166/default.pdf)

Configuration:
- Web browser and its version:chrome 92.0.4515.131
- Operating system and its [version:](url) windows
- PDF.js version:v2.9.359
- Is a browser extension:no

Steps to reproduce the problem:
1. use pdf.js to open this pdf file
2. incomplete content display


What is the expected behavior? (add screenshot)
![image](https://user-images.githubusercontent.com/16495895/132935415-2b52322d-561c-4f60-97df-24e4429743ff.png)

What went wrong? (add screenshot)
![image](https://user-images.githubusercontent.com/16495895/132935425-e5e6605b-71f5-4065-bb89-5c0fdbe1564b.png)

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

let numParen = 1;
    let done = false;
    const strBuf = this.strBuf;
    strBuf.length = 0;
    let ch = this.nextChar();
    while (true) {
      let charBuffered = false;
      switch (ch | 0) {
        case -1:
          warn("Unterminated string");
          done = true;
          break;
        case 0x28: 
          ++numParen;
          strBuf.push("(");
          break;
        case 0x29: 
          if (--numParen === 0) {
            this.nextChar(); 
            done = true;
          } else {
            strBuf.push(")");
          }
          break;
        case 0x5c: 
          ch = this.nextChar();
          switch (ch) {
            case -1: