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):

proto[0][2] || "Unknown", 
      proto[0][3] || "uniqueID", 
      proto[0][4] || name, 
      proto[0][5] || "Version 0.11", 
      proto[0][6] || "", 
      proto[0][7] || "Unknown", 
      proto[0][8] || "Unknown", 
      proto[0][9] || "Unknown", 
    ];
    
    
    var stringsUnicode = [];
    var i, ii, j, jj, str;
    for (i = 0, ii = strings.length; i < ii; i++) {
      str = proto[1][i] || strings[i];
      var strBufUnicode = [];
      for (j = 0, jj = str.length; j < jj; j++) {
        strBufUnicode.push(string16(str.charCodeAt(j)));
      }
      stringsUnicode.push(strBufUnicode.join(""));
    }
    var names = [strings, stringsUnicode];
    var platforms = ["\x00\x01", "\x00\x03"];
    var encodings = ["\x00\x00", "\x00\x01"];
    var languages = ["\x00\x00", "\x04\x09"];
    var namesRecordCount = strings.length * platforms.length;
    var nameTable =
      "\x00\x00" + 
      string16(namesRecordCount) + 
      string16(namesRecordCount * 12 + 6);