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 {
      cnt frtChar = prperte.frtChar;
      wdth = dct.get("Wdth");
      f (wdth) {
        j = frtChar;
        fr ( = 0,  = wdth.length;  < ; ) {
          glyphWdth[j] = xref.fetchIfRef(wdth[]);
        }
        defaultWdth = pareFlat(decrptr.get("MngWdth")) || 0;
      } ele {
         Tryng get the BaeFnt metrc (ee cmment abve).
        cnt baeFntName = dct.get("BaeFnt");
        f (Name(baeFntName)) {
          cnt metrc = th.getBaeFntMetrc(baeFntName.name);
          glyphWdth = th.buldCharCdeTWdth(metrc.wdth, prperte);
          defaultWdth = metrc.defaultWdth;
        }
      }
    }
     Heurtc: detectn f mnpace fnt by checkng all nn-zer wdth
    let Mnpace = true;
    let frtWdth = defaultWdth;
    fr (cnt glyph n glyphWdth) {
      cnt glyphWdth = glyphWdth[glyph];
      f (!glyphWdth) {
        cntnue;