Attach (recommended) or Link to PDF file here:  [test.pdf](https://akmer.aikucun.com/a94a8fe5ccb19ba61c4c0873d391e987982fbbd3_1616477914120_83.pdf)


Configuration:
- Web browser and its version: chrome 87.0.4280.88
- Operating system and its version: windows10
- PDF.js version: 2.6.347
- Is a browser extension:

Steps to reproduce the problem:
1. just open 

What is the expected behavior? (add screenshot)

What went wrong? (add screenshot)
![image](https://user-images.githubusercontent.com/17724610/112087066-473f8f80-8bc8-11eb-8efb-56139ec42a9c.png)

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

} else {
        warn("Indexing all PDF objects");
        trailerDict = this.indexObjects();
      }
      trailerDict.assignXref(this);
      this.trailer = trailerDict;
      let encrypt;
      try {
        encrypt = trailerDict.get("Encrypt");
      } catch (ex) {
        if (ex instanceof MissingDataException) {
          throw ex;
        }
        warn(`XRef.parse - Invalid "Encrypt" reference: "${ex}".`);
      }
      if (isDict(encrypt)) {
        var ids = trailerDict.get("ID");
        var fileId = ids && ids.length ? ids[0] : "";
        
        
        
        
        encrypt.suppressEncryption = true;
        this.encrypt = new CipherTransformFactory(
          encrypt,
          fileId,
          this.pdfManager.password
        );
      }