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):

const data = stringToUTF8String(bytesToString(stream.getBytes()));
          if (data) {
            metadata = new MetadataParser(data).serializable;
          }
        } catch (e) {
          if (e instanceof MissingDataException) {
            throw e;
          }
          info("Skipping invalid metadata.");
        }
      }
    }
    return shadow(this, "metadata", metadata);
  }
  get markInfo() {
    let markInfo = null;
    try {
      markInfo = this._readMarkInfo();
    } catch (ex) {
      if (ex instanceof MissingDataException) {
        throw ex;
      }
      warn("Unable to read mark info.");
    }
    return shadow(this, "markInfo", markInfo);
  }
  /**
   * @private
   */
  _readMarkInfo() {