Attach (recommended) or Link to PDF file here: https://www.recom-power.com/pdf/Powerline-AC-DC/RAC05-K.pdf

Configuration:
- Web browser and its version: Firefox 56.0 (64-bit)
- Operating system and its version: Windows 10 with OS Build 15063.632
- PDF.js version: ?
- Is an extension: Built-in

Steps to reproduce the problem:
1. Open Page

What is the expected behavior? To properly render the first page. 
![image](https://user-images.githubusercontent.com/1151969/31415345-b1504022-add7-11e7-855b-8030a308f7a2.png)

What went wrong? Renders poorly.
![image](https://user-images.githubusercontent.com/1151969/31415363-d8842096-add7-11e7-818d-728c1102891b.png)

Link to a viewer (if hosted on a site other than mozilla.github.io/pdf.js or as Firefox/Chrome extension): ?

);
          j += 6;
          break;
        case OPS.curveTo2:
          ctx.bezierCurveTo(
            x,
            y,
            args[j],
            args[j + 1],
            args[j + 2],
            args[j + 3]
          );
          x = args[j + 2];
          y = args[j + 3];
          j += 4;
          break;
        case OPS.curveTo3:
          x = args[j + 2];
          y = args[j + 3];
          ctx.bezierCurveTo(args[j], args[j + 1], x, y, x, y);
          j += 4;
          break;
        case OPS.closePath:
          ctx.closePath();
          break;
      }
    }
    current.setCurrentPoint(x, y);
  }
  closePath() {