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): ?

this.ctx.lineCap = LINE_CAP_STYLES[style];
  }
  setLineJoin(style) {
    this.ctx.lineJoin = LINE_JOIN_STYLES[style];
  }
  setMiterLimit(limit) {
    this.ctx.miterLimit = limit;
  }
  setDash(dashArray, dashPhase) {
    const ctx = this.ctx;
    if (ctx.setLineDash !== undefined) {
      ctx.setLineDash(dashArray);
      ctx.lineDashOffset = dashPhase;
    }
  }
  setRenderingIntent(intent) {
    
  }
  setFlatness(flatness) {
    
  }
  setGState(states) {
    for (let i = 0, ii = states.length; i < ii; i++) {
      const state = states[i];
      const key = state[0];
      const value = state[1];
      switch (key) {
        case "LW":