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):

expect(loadingTask).toEqual(data[1].loadingTask);
      await loadingTask.destroy();
    });
    it("creates pdf doc from URL and aborts before worker initialized", async function () {
      const loadingTask = getDocument(basicApiGetDocumentParams);
      expect(loadingTask instanceof PDFDocumentLoadingTask).toEqual(true);
      const destroyed = loadingTask.destroy();
      try {
        await loadingTask.promise;
        
        expect(false).toEqual(true);
      } catch (reason) {
        expect(true).toEqual(true);
        await destroyed;
      }
    });
    it("creates pdf doc from URL and aborts loading after worker initialized", async function () {
      const loadingTask = getDocument(basicApiGetDocumentParams);
      expect(loadingTask instanceof PDFDocumentLoadingTask).toEqual(true);
      
      
      const destroyed = loadingTask._worker.promise.then(function () {
        return loadingTask.destroy();
      });
      await destroyed;
      expect(true).toEqual(true);
    });
    it("creates pdf doc from typed array", async function () {
      const typedArrayPdf = await DefaultFileReaderFactory.fetch({
        path: TEST_PDFS_PATH + basicApiFileName,