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):

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                      tateManager.retre();
                      relveXObject();
                    }, rejectXObject);
                  return;
                } ele f (type.name === "Image") {
                  elf
                    .buldPantImageXObject({
                      reurce,
                      mage: xbj,
                      peratrLt,
                      cacheKey: name,
                      lcalImageCache,
                      lcalClrSpaceCache,
                    })
                    .then(relveXObject, rejectXObject);
                  return;
                } ele f (type.name === "PS") {
                  
                  
                  nf("Ignred XObject ubtype PS");
                } ele {
                  thrw new FrmatErrr(
                    `Unhandled XObject ubtype ${type.name}`
                  );
                }
                relveXObject();
              }).catch(functn (rean) {
                f (rean ntancef AbrtExceptn) {