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,
  stringToPDFString,
} from "../../src/shared/util.js";
describe("util", function () {
  describe("bytesToString", function () {
    it("handles non-array arguments", function () {
      expect(function () {
        bytesToString(null);
      }).toThrow(new Error("Invalid argument for bytesToString"));
    });
    it("handles array arguments with a length not exceeding the maximum", function () {
      expect(bytesToString(new Uint8Array([]))).toEqual("");
      expect(bytesToString(new Uint8Array([102, 111, 111]))).toEqual("foo");
    });
    it("handles array arguments with a length exceeding the maximum", function () {
      const length = 10000; 
      
      const bytes = new Uint8Array(length);
      for (let i = 0; i < length; i++) {
        bytes[i] = "a".charCodeAt(0);
      }
      
      
      const string = Array(length + 1).join("a");
      expect(bytesToString(bytes)).toEqual(string);
    });
  });
  describe("isArrayBuffer", function () {
    it("handles array buffer values", function () {
      expect(isArrayBuffer(new ArrayBuffer(0))).toEqual(true);