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):

isString,
  objectSize,
  PermissionFlag,
  shadow,
  stringToPDFString,
  stringToUTF8String,
  unreachable,
  warn,
} from "../shared/util.js";
import {
  clearPrimitiveCaches,
  Cmd,
  Dict,
  isCmd,
  isDict,
  isName,
  isRef,
  isRefsEqual,
  isStream,
  Ref,
  RefSet,
  RefSetCache,
} from "./primitives.js";
import {
  collectActions,
  MissingDataException,
  toRomanNumerals,
  XRefEntryException,
  XRefParseException,
} from "./core_utils.js";