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 header = file.peekBytes(4);
    return bytesToString(header) === "ttcf";
  }
  function isOpenTypeFile(file) {
    var header = file.peekBytes(4);
    return bytesToString(header) === "OTTO";
  }
  function isType1File(file) {
    var header = file.peekBytes(2);
    
    if (header[0] === 0x25 && header[1] === 0x21) {
      return true;
    }
    
    
    if (header[0] === 0x80 && header[1] === 0x01) {
      return true;
    }
    return false;
  }
  /**
   * Compared to other font formats, the header in CFF files is not constant
   * but contains version numbers. To reduce the possibility of misclassifying
   * font files as CFF, it's recommended to check for other font formats first.
   */
  function isCFFFile(file) {