Attach (recommended) or Link to PDF file here:
PDF is [Sample lease contract 26.pdf](https://github.com/mozilla/pdf.js/files/1500985/Sample.lease.contract.26.pdf)

Steps to reproduce the problem:
I am using [https://mozilla.github.io/pdf.js/web/viewer.html](url) to preview pdf by opening the pdf.

now am searching for "**made is**" but its not showing in the pdfjs

and while selecting and copying pdf  text it has no space in b/w words

if (properties.isInternalFont) {
    return;
  }
  if (builtInEncoding === properties.defaultEncoding) {
    return; 
  }
  if (properties.toUnicode instanceof IdentityToUnicodeMap) {
    return;
  }
  const toUnicode = [],
    glyphsUnicodeMap = getGlyphsUnicode();
  for (const charCode in builtInEncoding) {
    if (properties.hasIncludedToUnicodeMap) {
      if (properties.toUnicode.has(charCode)) {
        continue; 
      }
    } else if (properties.hasEncoding) {
      if (
        properties.differences.length === 0 ||
        properties.differences[charCode] !== undefined
      ) {
        continue; 
      }
    }
    const glyphName = builtInEncoding[charCode];
    const unicode = getUnicodeForGlyph(glyphName, glyphsUnicodeMap);
    if (unicode !== -1) {