Viewer:  https://mozilla.github.io/pdf.js/web/viewer.html
Chrome on Windows 10
When the attached PDF file is viewed, some of the fonts display as garbled text. 
[Arial, Courier, Times New Roman]
The file views correctly in Adobe Reader.
[fff.pdf](https://github.com/mozilla/pdf.js/files/4652174/fff.pdf)

"\x01\xDF" + 
    "\x00\x31" + 
    "\x01\x02" + 
    "\x00\x00" + 
    "\x00\x00\x06" +
    String.fromCharCode(properties.fixedPitch ? 0x09 : 0x00) +
    "\x00\x00\x00\x00\x00\x00" + 
    string32(ulUnicodeRange1) + 
    string32(ulUnicodeRange2) + 
    string32(ulUnicodeRange3) + 
    string32(ulUnicodeRange4) + 
    "\x2A\x32\x31\x2A" + 
    string16(properties.italicAngle ? 1 : 0) + 
    string16(firstCharIndex || properties.firstChar) + 
    string16(lastCharIndex || properties.lastChar) + 
    string16(typoAscent) + 
    string16(typoDescent) + 
    "\x00\x64" + 
    string16(winAscent) + 
    string16(winDescent) + 
    "\x00\x00\x00\x00" + 
    "\x00\x00\x00\x00" + 
    string16(properties.xHeight) + 
    string16(properties.capHeight) + 
    string16(0) + 
    string16(firstCharIndex || properties.firstChar) + 
    "\x00\x03"
  ); 
}
function createPostTable(properties) {