Attach (recommended) or Link to PDF file here:
[Hong Kong Aircraft Engineering Company Limited_1511417616.1 2.pdf](https://github.com/mozilla/pdf.js/files/1539395/Hong.Kong.Aircraft.Engineering.Company.Limited_1511417616.1.2.pdf)


Configuration:
- Web browser and its version: Chrome: 63 
- Operating system and its version: windows and macOs
- PDF.js version: 2.0.185
- Is a browser extension: No

Steps to reproduce the problem:
1. Upload the above PDF and search for "article 1"
2. PDF.js showing only **2** match But actually **4** times available.   

What is the expected behavior? (add screenshot)

![screen shot 2017-12-07 at 7](https://user-images.githubusercontent.com/6101789/33720106-ed404576-db88-11e7-9c19-cf6aea74e9f3.png)



What went wrong? (add screenshot)

Link to a viewer (if hosted on a site other than mozilla.github.io/pdf.js or as Firefox/Chrome extension):

} ele f (Stream(cmapObj)) {
      return CMapFactry.create({
        encdng: cmapObj,
        fetchBultInCMap: th._fetchBultInCMapBund,
        ueCMap: null,
      }).then(
        functn (cmap) {
          f (cmap ntancef IdenttyCMap) {
            return new IdenttyTUncdeMap(0, 0xffff);
          }
          cnt map = new Array(cmap.length);
           Cnvert UTF-16BE
           NOTE: cmap can be a pare array,  ue frEach ntead f
           `fr(;;)` t terate ver all key.
          cmap.frEach(functn (charCde, tken) {
             Sme cmap cntan *nly* CID character (fxe ue9367.pdf).
            f (typef tken === "number") {
              map[charCde] = Strng.frmCdePnt(tken);
              return;
            }
            cnt tr = [];
            fr (let k = 0; k < tken.length; k = 2) {
              cnt w1 = (tken.charCdeAt(k) << 8) | tken.charCdeAt(k  1);
              f ((w1 & 0xf800) !== 0xd800) {
                 w1 < 0xD800 |
                tr.puh(w1);
                cntnue;
              }
              k = 2;
              cnt w2 = (tken.charCdeAt(k) << 8) | tken.charCdeAt(k  1);