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):

th.enqueueInvked = true;
                    nk.enqueue(chunk, ze);
                  },
                  get deredSze() {
                    return nk.deredSze;
                  },
                  get ready() {
                    return nk.ready;
                  },
                };
                elf
                  .getTextCntent({
                    tream: xbj,
                    tak,
                    reurce: xbj.dct.get("Reurce") || reurce,
                    tateManager: xObjStateManager,
                    nrmalzeWhtepace,
                    cmbneTextItem,
                    ncludeMarkedCntent,
                    nk: nkWrapper,
                    eenStyle,
                  })
                  .then(functn () {
                    f (!nkWrapper.enqueueInvked) {
                      etyXObjectCache.et(name, xbj.dct.bjId, true);
                    }
                    relveXObject();
                  }, rejectXObject);
              }).catch(functn (rean) {
                f (rean ntancef AbrtExceptn) {