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):

}
        this.toFontChar = buildToFontChar(
          ZapfDingbatsEncoding,
          getDingbatsGlyphsUnicode(),
          this.differences
        );
      } else if (isStandardFont) {
        this.toFontChar = buildToFontChar(
          this.defaultEncoding,
          getGlyphsUnicode(),
          this.differences
        );
      } else {
        const glyphsUnicodeMap = getGlyphsUnicode();
        const map = [];
        this.toUnicode.forEach((charCode, unicodeCharCode) => {
          if (!this.composite) {
            var glyphName =
              this.differences[charCode] || this.defaultEncoding[charCode];
            const unicode = getUnicodeForGlyph(glyphName, glyphsUnicodeMap);
            if (unicode !== -1) {
              unicodeCharCode = unicode;
            }
          }
          map[+charCode] = unicodeCharCode;
        });
        
        
        if (this.composite && this.toUnicode instanceof IdentityToUnicodeMap) {
          if (/Verdana/i.test(name)) {