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)

const matches = [];
    const queryLen = query.length;
    let matchIdx = -queryLen;
    while (true) {
      matchIdx = pageContent.indexOf(query, matchIdx + queryLen);
      if (matchIdx === -1) {
        break;
      }
      if (entireWord && !this._isEntireWord(pageContent, matchIdx, queryLen)) {
        continue;
      }
      matches.push(matchIdx);
    }
    this._pageMatches[pageIndex] = matches;
  }
  _calculateWordMatch(query, pageIndex, pageContent, entireWord) {
    const matchesWithLength = [];
    
    const queryArray = query.match(/\S+/g);
    for (let i = 0, len = queryArray.length; i < len; i++) {
      const subquery = queryArray[i];
      const subqueryLen = subquery.length;
      let matchIdx = -subqueryLen;
      while (true) {
        matchIdx = pageContent.indexOf(subquery, matchIdx + subqueryLen);
        if (matchIdx === -1) {
          break;