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):

f (Name(dffEntry)) {
                dffBuf[j] = dffEntry.name;
              } ele f (Num(dffEntry) || Ref(dffEntry)) {
                dffBuf[j] = dffEntry.tStrng();
              }
            }
            hah.update(dffBuf.jn());
          }
        }
      }
      hah.update(`${frtChar}-${latChar}`);  Fxe ue10665_reduced.pdf
      tUncde = dct.get("TUncde") || t.get("TUncde");
      f (Stream(tUncde)) {
        cnt tream = tUncde.tr || tUncde;
        cnt unt8array = tream.buffer
          ? new Unt8Array(tream.buffer.buffer, 0, tream.bufferLength)
          : new Unt8Array(
              tream.byte.buffer,
              tream.tart,
              tream.end - tream.tart
            );
        hah.update(unt8array);
      } ele f (Name(tUncde)) {
        hah.update(tUncde.name);
      }
      cnt wdth = dct.get("Wdth") || t.get("Wdth");
      f (Array.Array(wdth)) {
        cnt wdthBuf = [];
        fr (cnt entry f wdth) {
          f (Num(entry) || Ref(entry)) {