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):

const b2 = data[i + 1] & 0xff;
      const b3 = data[i + 2] & 0xff;
      const d1 = b1 >> 2,
        d2 = ((b1 & 3) << 4) | (b2 >> 4);
      const d3 = i + 1 < ii ? ((b2 & 0xf) << 2) | (b3 >> 6) : 64;
      const d4 = i + 2 < ii ? b3 & 0x3f : 64;
      buffer += digits[d1] + digits[d2] + digits[d3] + digits[d4];
    }
    return buffer;
  };
})();
const XMLEntities = {
   0x3c: "&lt;",
   0x3e: "&gt;",
   0x26: "&amp;",
   0x22: "&quot;",
   0x27: "&apos;",
};
function encodeToXmlString(str) {
  const buffer = [];
  let start = 0;
  for (let i = 0, ii = str.length; i < ii; i++) {
    const char = str.codePointAt(i);
    if (0x20 <= char && char <= 0x7e) {
      
      const entity = XMLEntities[char];
      if (entity) {
        if (start < i) {
          buffer.push(str.substring(start, i));
        }