Attach (recommended) or Link to PDF file here:
https://www.nta.go.jp/taxes/tetsuzuki/shinsei/annai/joyaku/annai/pdf2/250.pdf

Configuration:
- Web browser and its version: Firefox 81.0a1
- Operating system and its version: Debian 5.6.7-1
- PDF.js version: latest in Firefox nightly
- Is a browser extension: No

Steps to reproduce the problem:
1. Open the pdf and paste the following text "本 店 又 は 主 た る 事 務 所 の 所 在 地" in "Full name" and in "Domicile and residence" textfields
2. Print or Save the pdf 

What is the expected behavior? (add screenshot)
![image](https://user-images.githubusercontent.com/5641725/91207547-30f05480-e709-11ea-9abd-2af5d970dc46.png)

What went wrong? (add screenshot)
![image](https://user-images.githubusercontent.com/5641725/91207663-69902e00-e709-11ea-8a1d-1ddd30cf0621.png)

Link to a viewer (if hosted on a site other than mozilla.github.io/pdf.js or as Firefox/Chrome extension):

stringToBytes(null);
      }).toThrow(new Error("Invalid argument for stringToBytes"));
    });
    it("handles string arguments", function () {
      expect(stringToBytes("")).toEqual(new Uint8Array([]));
      expect(stringToBytes("foo")).toEqual(new Uint8Array([102, 111, 111]));
    });
  });
  describe("stringToPDFString", function () {
    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";