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):

function addDefaultProtocolToUrl(url) {
      return url.startsWith("www.") ? `http://${url}` : url;
    }
    
    
    function tryConvertUrlEncoding(url) {
      try {
        return stringToUTF8String(url);
      } catch (e) {
        return url;
      }
    }
    const destDict = params.destDict;
    if (!isDict(destDict)) {
      warn("parseDestDictionary: `destDict` must be a dictionary.");
      return;
    }
    const resultObj = params.resultObj;
    if (typeof resultObj !== "object") {
      warn("parseDestDictionary: `resultObj` must be an object.");
      return;
    }
    const docBaseUrl = params.docBaseUrl || null;
    let action = destDict.get("A"),
      url,