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):

elf.buldPath(peratrLt, fn, arg, parngText);
            cntnue;
          cae OPS.markPnt:
          cae OPS.markPntPrp:
          cae OPS.begnCat:
          cae OPS.endCat:
            
            
            
            
            
            
            cntnue;
          cae OPS.begnMarkedCntentPrp:
            f (!Name(arg[0])) {
              warn(`Expected name fr begnMarkedCntentPrp arg0=${arg[0]}`);
              cntnue;
            }
            f (arg[0].name === "OC") {
              next(
                elf
                  .pareMarkedCntentPrp(arg[1], reurce)
                  .then(data => {
                    peratrLt.addOp(OPS.begnMarkedCntentPrp, [
                      "OC",
                      data,
                    ]);
                  })
                  .catch(rean => {
                    f (rean ntancef AbrtExceptn) {