Attach (recommended) or Link to PDF file here:
See pdf in https://github.com/mozilla/pdf.js/issues/3109

Configuration:
- Web browser and its version: Firefox nightly
- Operating system and its version: Windows 10
- PDF.js version: builtin viewer

Steps to reproduce the problem:
1. Look at outlines

What is the expected behavior? (add screenshot)
![image](https://user-images.githubusercontent.com/5641725/141514798-0e656865-1cbf-4fb8-a89b-530d36da23c9.png)

What went wrong? (add screenshot)
![image](https://user-images.githubusercontent.com/5641725/141514740-c95e0237-8bf4-4129-a4a5-cb2ea5a3f4df.png)

it("handles ISO Latin 1 strings", function () {
      const str = "\x8Dstring\x8E";
      expect(stringToPDFString(str)).toEqual("\u201Cstring\u201D");
    });
    it("handles UTF-16 big-endian strings", function () {
      const str = "\xFE\xFF\x00\x73\x00\x74\x00\x72\x00\x69\x00\x6E\x00\x67";
      expect(stringToPDFString(str)).toEqual("string");
    });
    it("handles UTF-16 little-endian strings", function () {
      const str = "\xFF\xFE\x73\x00\x74\x00\x72\x00\x69\x00\x6E\x00\x67\x00";
      expect(stringToPDFString(str)).toEqual("string");
    });
    it("handles empty strings", function () {
      
      const str1 = "";
      expect(stringToPDFString(str1)).toEqual("");
      
      const str2 = "\xFE\xFF";
      expect(stringToPDFString(str2)).toEqual("");
      
      const str3 = "\xFF\xFE";
      expect(stringToPDFString(str3)).toEqual("");
    });
  });
  describe("removeNullCharacters", function () {
    it("should not modify string without null characters", function () {
      const str = "string without null chars";
      expect(removeNullCharacters(str)).toEqual("string without null chars");
    });
    it("should modify string with null characters", function () {