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):

}
          strBuf.push(String.fromCharCode((firstDigit << 4) | secondDigit));
        }
        isFirstHex = !isFirstHex;
        ch = this.nextChar();
      }
    }
    return strBuf.join("");
  }
  getObj() {
    
    let comment = false;
    let ch = this.currentChar;
    while (true) {
      if (ch < 0) {
        return EOF;
      }
      if (comment) {
        if (ch ===  0x0a || ch ===  0x0d) {
          comment = false;
        }
      } else if (ch ===  0x25) {
        comment = true;
      } else if (specialChars[ch] !== 1) {
        break;
      }
      ch = this.nextChar();
    }
    
    switch (ch | 0) {