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):

function (reason) {
          expect(reason instanceof Error).toEqual(true);
        }
      );
      nonIntegerPromise = nonIntegerPromise.then(
        function () {
          throw new Error("shall fail for non-integer pageNumber parameter");
        },
        function (reason) {
          expect(reason instanceof Error).toEqual(true);
        }
      );
      nonNumberPromise = nonNumberPromise.then(
        function () {
          throw new Error("shall fail for non-number pageNumber parameter");
        },
        function (reason) {
          expect(reason instanceof Error).toEqual(true);
        }
      );
      await Promise.all([
        outOfRangePromise,
        nonIntegerPromise,
        nonNumberPromise,
      ]);
    });
    it("gets page, from /Pages tree with circular reference", async function () {
      const loadingTask = getDocument(
        buildGetDocumentParams("Pages-tree-refs.pdf")
      );