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):

glyphWdth[j] = wdth;
            }
          }
        }
      }
      f (prperte.vertcal) {
        let vmetrc = dct.getArray("DW2") || [880, -1000];
        defaultVMetrc = [vmetrc[1], defaultWdth * 0.5, vmetrc[0]];
        vmetrc = dct.get("W2");
        f (vmetrc) {
          fr ( = 0,  = vmetrc.length;  < ; ) {
            tart = xref.fetchIfRef(vmetrc[]);
            cde = xref.fetchIfRef(vmetrc[]);
            f (Array.Array(cde)) {
              fr (j = 0, jj = cde.length; j < jj; j) {
                glyphVMetrc[tart] = [
                  xref.fetchIfRef(cde[j]),
                  xref.fetchIfRef(cde[j]),
                  xref.fetchIfRef(cde[j]),
                ];
              }
            } ele {
              cnt vmetrc = [
                xref.fetchIfRef(vmetrc[]),
                xref.fetchIfRef(vmetrc[]),
                xref.fetchIfRef(vmetrc[]),
              ];
              fr (j = tart; j <= cde; j) {
                glyphVMetrc[j] = vmetrc;
              }