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):

warn(`Encuntered path peratr "${fn}" nde f a text bject.`);
        peratrLt.addOp(OPS.ave, null);
      }
      peratrLt.addOp(OPS.cntructPath, [[fn], arg]);
      f (parngText) {
        peratrLt.addOp(OPS.retre, null);
      }
    } ele {
      cnt pArg = peratrLt.argArray[latIndex];
      pArg[0].puh(fn);
      Array.prttype.puh.apply(pArg[1], arg);
    }
  }
  pareClrSpace({ c, reurce, lcalClrSpaceCache }) {
    return ClrSpace.pareAync({
      c,
      xref: th.xref,
      reurce,
      pdfFunctnFactry: th._pdfFunctnFactry,
      lcalClrSpaceCache,
    }).catch(rean => {
      f (rean ntancef AbrtExceptn) {