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):

const strBuf = this.strBuf;
    strBuf.length = 0;
    let ch = this.currentChar;
    let isFirstHex = true;
    let firstDigit, secondDigit;
    this._hexStringNumWarn = 0;
    while (true) {
      if (ch < 0) {
        warn("Unterminated hex string");
        break;
      } else if (ch ===  0x3e) {
        this.nextChar();
        break;
      } else if (specialChars[ch] === 1) {
        ch = this.nextChar();
        continue;
      } else {
        if (isFirstHex) {
          firstDigit = toHexDigit(ch);
          if (firstDigit === -1) {
            this._hexStringWarn(ch);
            ch = this.nextChar();
            continue;
          }
        } else {
          secondDigit = toHexDigit(ch);
          if (secondDigit === -1) {
            this._hexStringWarn(ch);
            ch = this.nextChar();
            continue;