Here, i have attached the PDF, that PDF document contains "Nudi" as an embedded font. When i searching the particular word (that in Nudi font), the search result selecting the word that context next to the exact word.

Link to PDF file (or attach file here):
[sample_pdf.zip](https://github.com/mozilla/pdf.js/files/229582/sample_pdf.zip)

Configuration:
- Web browser and its version: Mozilla 45.0.2
- Operating system and its version: Windows 7
- PDF.js version: 1.4.20-disc

What is the expected behavior? (add screenshot)
![find_01](https://cloud.githubusercontent.com/assets/17423938/14704922/c2e67f2c-07d4-11e6-9320-9aed2578d377.png)

beginText(begin);
      } else {
        appendTextToDiv(prevEnd.divIdx, prevEnd.offset, begin.offset);
      }
      if (begin.divIdx === end.divIdx) {
        appendTextToDiv(
          begin.divIdx,
          begin.offset,
          end.offset,
          "highlight" + highlightSuffix
        );
      } else {
        appendTextToDiv(
          begin.divIdx,
          begin.offset,
          infinity.offset,
          "highlight begin" + highlightSuffix
        );
        for (let n0 = begin.divIdx + 1, n1 = end.divIdx; n0 < n1; n0++) {
          textDivs[n0].className = "highlight middle" + highlightSuffix;
        }
        beginText(end, "highlight end" + highlightSuffix);
      }
      prevEnd = end;
    }
    if (prevEnd) {
      appendTextToDiv(prevEnd.divIdx, prevEnd.offset, infinity.offset);
    }
  }
  _updateMatches() {