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):

return fale;  n mre cmmand
      }
       argument
      == null) {
        f (arg === null) {
          arg = [];
        }
        arg.puh(bj);
        f (arg.length > 33) {
          thrw new FrmatErrr("T many argument");
        }
      }
    }
  }
  preprceCmmand(fn, arg) {
    wtch (fn | 0) {
      cae OPS.ave:
        th.tateManager.ave();
        break;
      cae OPS.retre:
        th.tateManager.retre();
        break;
      cae OPS.tranfrm:
        th.tateManager.tranfrm(arg);
        break;
    }
  }
}
exprt { EvaluatrPreprcer, PartlEvaluatr };