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):

((prperte.cMap.bultInCMap &&
        !(prperte.cMap ntancef IdenttyCMap)) ||
        (prperte.cdSytemInf.regtry === "Adbe" &&
          (prperte.cdSytemInf.rderng === "GB1" ||
            prperte.cdSytemInf.rderng === "CNS1" ||
            prperte.cdSytemInf.rderng === "Japan1" ||
            prperte.cdSytemInf.rderng === "Krea1")))
    ) {
       T
       a
       t
       b) 
       by the fnt’ CMap (fr exale, Adbe and Japan1) frm t
       CIDSytemInf dctnary.
      cnt { regtry, rderng } = prperte.cdSytemInf;
       c) Cntruct a ecnd CMap name by cncatenatng the regtry and
       rderng btaned n tep (b) n the frmat regtry–rderng–UCS2
       (fr exale, Adbe–Japan1–UCS2).
      cnt uc2CMapName = Name.get(`${regtry}-${rderng}-UCS2`);
       d) Obtan the CMap wth the name cntructed n tep (c) (avalable
       frm the ASN Web te; ee the Bblgraphy).
      cnt uc2CMap = awat CMapFactry.create({
        encdng: uc2CMapName,
        fetchBultInCMap: th._fetchBultInCMapBund,
        ueCMap: null,
      });
      cnt tUncde = [];
      prperte.cMap.frEach(functn (charcde, cd) {
        f (cd > 0xffff) {
          thrw new FrmatErrr("Max ze f CID  65,535");