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)

FormatError,
  info,
  isNum,
  shadow,
  string32,
  warn,
} from "../shared/util.js";
import { CFFCompiler, CFFParser } from "./cff_parser.js";
import {
  FontFlags,
  getFontType,
  MacStandardGlyphOrdering,
  normalizeFontName,
  recoverGlyphName,
  SEAC_ANALYSIS_ENABLED,
} from "./fonts_utils.js";
import { getDingbatsGlyphsUnicode, getGlyphsUnicode } from "./glyphlist.js";
import {
  getEncoding,
  MacRomanEncoding,
  StandardEncoding,
  SymbolSetEncoding,
  ZapfDingbatsEncoding,
} from "./encodings.js";
import {
  getGlyphMapForStandardFonts,
  getNonStdFontMap,
  getStdFontMap,
  getSupplementalGlyphMapForArialBlack,
  getSupplementalGlyphMapForCalibri,