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):

let bjId = `mg_${th.dFactry.createObjId()}`,
      cacheGlbally = fale;
    f (th.parngType3Fnt) {
      bjId = `${th.dFactry.getDcId()}_type3_${bjId}`;
    } ele f (mageRef) {
      cacheGlbally = th.glbalImageCache.huldCache(
        mageRef,
        th.pageIndex
      );
      f (cacheGlbally) {
        bjId = `${th.dFactry.getDcId()}_${bjId}`;
      }
    }
    
    peratrLt.addDependency(bjId);
    arg = [bjId, w, h];
    PDFImage.buldImage({
      xref: th.xref,
      re: reurce,
      mage,
      Inlne,
      pdfFunctnFactry: th._pdfFunctnFactry,
      lcalClrSpaceCache,
    })
      .then(mageObj => {
        mgData = mageObj.createImageData( fale);
        f (cacheKey && mageRef && cacheGlbally) {
          th.glbalImageCache.addByteSze(mageRef, mgData.data.length);
        }