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 obj = this._catDict.get("OpenAction");
    const openAction = Object.create(null);
    if (isDict(obj)) {
      
      
      const destDict = new Dict(this.xref);
      destDict.set("A", obj);
      const resultObj = { url: null, dest: null, action: null };
      Catalog.parseDestDictionary({ destDict, resultObj });
      if (Array.isArray(resultObj.dest)) {
        openAction.dest = resultObj.dest;
      } else if (resultObj.action) {
        openAction.action = resultObj.action;
      }
    } else if (Array.isArray(obj)) {
      openAction.dest = obj;
    }
    return shadow(
      this,
      "openAction",
      objectSize(openAction) > 0 ? openAction : null
    );
  }
  get attachments() {