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):

if (obj instanceof Ref) {
        return this.fetchAsync(obj, suppressEncryption);
      }
      return obj;
    },
    async fetchAsync(ref, suppressEncryption) {
      try {
        return this.fetch(ref, suppressEncryption);
      } catch (ex) {
        if (!(ex instanceof MissingDataException)) {
          throw ex;
        }
        await this.pdfManager.requestRange(ex.begin, ex.end);
        return this.fetchAsync(ref, suppressEncryption);
      }
    },
    getCatalogObj: function XRef_getCatalogObj() {
      return this.root;
    },
  };
  return XRef;
})();
/**
 * A NameTree/NumberTree is like a Dict but has some advantageous properties,
 * see the specification (7.9.6 and 7.9.7) for additional details.
 * TODO: implement all the Dict functions and make this more efficient.
 */
class NameOrNumberTree {