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):

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    bytes[index] = value >>> 8;
  }
  function signedInt16(b0, b1) {
    var value = (b0 << 8) + b1;
    return value & (1 << 15) ? value - 0x10000 : value;
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    return String.fromCharCode((value >> 8) & 0xff, value & 0xff);
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    }
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  }
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    var header = file.peekBytes(4);
    return (
      readUint32(header, 0) === 0x00010000 || bytesToString(header) === "true"
    );
  }
  function isTrueTypeCollectionFile(file) {