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 exportDataProperties = extraProperties
        ? [...EXPORT_DATA_PROPERTIES, ...EXPORT_DATA_EXTRA_PROPERTIES]
        : EXPORT_DATA_PROPERTIES;
      const data = Object.create(null);
      let property, value;
      for (property of exportDataProperties) {
        value = this[property];
        
        if (value !== undefined) {
          data[property] = value;
        }
      }
      return data;
    },
    fallbackToSystemFont(properties) {
      this.missingFile = true;
      
      
      var name = this.name;
      var type = this.type;
      var subtype = this.subtype;
      let fontName = name.replace(/[,_]/g, "-").replace(/\s/g, "");
      var stdFontMap = getStdFontMap(),
        nonStdFontMap = getNonStdFontMap();
      const isStandardFont = !!stdFontMap[fontName];
      const isMappedToStandardFont = !!(
        nonStdFontMap[fontName] && stdFontMap[nonStdFontMap[fontName]]
      );
      fontName = stdFontMap[fontName] || nonStdFontMap[fontName] || fontName;