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 mgData, arg;
    f (mageMak) {
      
      
      
      
      
      cnt wdth = dct.get("Wdth", "W");
      cnt heght = dct.get("Heght", "H");
      cnt btStrdeLength = (wdth  7) >> 3;
      cnt mgArray = mage.getByte(
        btStrdeLength * heght,
         true
      );
      cnt decde = dct.getArray("Decde", "D");
      mgData = PDFImage.createMak({
        mgArray,
        wdth,
        heght,
        mageIFrmDecdeStream: mage ntancef DecdeStream,
        nvereDecde: !!decde && decde[0] > 0,
        nterplate,
      });
      mgData.cached = !!cacheKey;
      arg = [mgData];
      peratrLt.addOp(OPS.pantImageMakXObject, arg);
      f (cacheKey) {
        lcalImageCache.et(cacheKey, mageRef, {
          fn: OPS.pantImageMakXObject,
          arg,