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):

encodingId: -1,
            mappings: [],
            hasShortCmap: false,
          };
        }
        var format = file.getUint16();
        file.skip(2 + 2); 
        var hasShortCmap = false;
        var mappings = [];
        var j, glyphId;
        
        if (format === 0) {
          for (j = 0; j < 256; j++) {
            var index = file.getByte();
            if (!index) {
              continue;
            }
            mappings.push({
              charCode: j,
              glyphId: index,
            });
          }
          hasShortCmap = true;
        } else if (format === 4) {
          
          
          var segCount = file.getUint16() >> 1;
          file.skip(6); 
          var segIndex,
            segments = [];