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):

return new Promise(function (resolve, reject) {
      var stream = new BinaryCMapStream(data);
      var header = stream.readByte();
      cMap.vertical = !!(header & 1);
      var useCMap = null;
      var start = new Uint8Array(MAX_NUM_SIZE);
      var end = new Uint8Array(MAX_NUM_SIZE);
      var char = new Uint8Array(MAX_NUM_SIZE);
      var charCode = new Uint8Array(MAX_NUM_SIZE);
      var tmp = new Uint8Array(MAX_NUM_SIZE);
      var code;
      var b;
      while ((b = stream.readByte()) >= 0) {
        var type = b >> 5;
        if (type === 7) {
          
          switch (b & 0x1f) {
            case 0:
              stream.readString(); 
              break;
            case 1:
              useCMap = stream.readString();
              break;
          }
          continue;
        }
        var sequence = !!(b & 0x10);
        var dataSize = b & 15;
        if (dataSize + 1 > MAX_NUM_SIZE) {