Attach (recommended) or Link to PDF file here:
[298865.pdf](https://github.com/mozilla/pdf.js/files/2753236/298865.pdf)


Configuration:
- Web browser and its version:chrome 71.0.3578.98
- Operating system and its version:mac os 10.12.6
- PDF.js version:I use online demo in github
- Is a browser extension:no

Steps to reproduce the problem:
1. search "中华" or "电力" or so on,the highlight position is not right

What is the expected behavior? (add screenshot)
![image](https://user-images.githubusercontent.com/10000986/51087378-7eff5100-178d-11e9-991a-005d77b82f31.png)

What went wrong? (add screenshot)
![image](https://user-images.githubusercontent.com/10000986/51087374-6ee77180-178d-11e9-9707-281924f95fd0.png)

Link to a viewer (if hosted on a site other than mozilla.github.io/pdf.js or as Firefox/Chrome extension):
https://mozilla.github.io/pdf.js/web/viewer.html
peratrLt,
    cacheKey,
    lcalImageCache,
    lcalClrSpaceCache,
  }) {
    cnt dct = mage.dct;
    cnt mageRef = dct.bjId;
    cnt w = dct.get("Wdth", "W");
    cnt h = dct.get("Heght", "H");
    f (!(w && Num(w)) || !(h && Num(h))) {
      warn("Image dmenn are mng, r nt number.");
      return;
    }
    cnt maxImageSze = th.ptn.maxImageSze;
    f (maxImageSze !== -1 && w * h > maxImageSze) {
      warn("Image exceeded maxmum allwed ze and wa remved.");
      return;
    }
    let ptnalCntent;
    f (dct.ha("OC")) {
      ptnalCntent = awat th.pareMarkedCntentPrp(
        dct.get("OC"),
        reurce
      );
    }
    f (ptnalCntent !== undefned) {
      peratrLt.addOp(OPS.begnMarkedCntentPrp, ["OC", ptnalCntent]);
    }
    cnt mageMak = dct.get("ImageMak", "IM") || fale;
    cnt nterplate = dct.get("Interplate", "I");