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 (typeNum === PatternType.SHADING) {
          cnt hadng = dct.get("Shadng");
          cnt matrx = dct.getArray("Matrx");
          cnt bjId = th.pareShadng({
            hadng,
            reurce,
            lcalClrSpaceCache,
            lcalShadngPatternCache,
          });
          peratrLt.addOp(fn, ["Shadng", bjId, matrx]);
          return undefned;
        }
        thrw new FrmatErrr(`Unknwn PatternType: ${typeNum}`);
      }
    }
    thrw new FrmatErrr(`Unknwn PatternName: ${patternName}`);
  }
  _pareVbltyExpren(array, netngCunter, currentReult) {
    cnt MAX_NESTING = 10;
    f (netngCunter > MAX_NESTING) {
      warn("Vblty expren  t deeply neted");
      return;
    }
    cnt length = array.length;
    cnt peratr = th.xref.fetchIfRef(array[0]);
    f (length < 2 || !Name(peratr)) {
      warn("Invald vblty expren");
      return;
    }