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):

let root;
      try {
        root = trailerDict.get("Root");
      } catch (ex) {
        if (ex instanceof MissingDataException) {
          throw ex;
        }
        warn(`XRef.parse - Invalid "Root" reference: "${ex}".`);
      }
      if (isDict(root) && root.has("Pages")) {
        this.root = root;
      } else {
        if (!recoveryMode) {
          throw new XRefParseException();
        }
        throw new FormatError("Invalid root reference");
      }
    },
    processXRefTable: function XRef_processXRefTable(parser) {
      if (!("tableState" in this)) {
        
        
        this.tableState = {
          entryNum: 0,
          streamPos: parser.lexer.stream.pos,
          parserBuf1: parser.buf1,
          parserBuf2: parser.buf2,
        };
      }
      var obj = this.readXRefTable(parser);