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): ?

const ctx = this.ctx;
    const current = this.current;
    const font = current.font;
    const fontSize = current.fontSize;
    const fontDirection = current.fontDirection;
    const spacingDir = font.vertical ? 1 : -1;
    const charSpacing = current.charSpacing;
    const wordSpacing = current.wordSpacing;
    const textHScale = current.textHScale * fontDirection;
    const fontMatrix = current.fontMatrix || FONT_IDENTITY_MATRIX;
    const glyphsLength = glyphs.length;
    const isTextInvisible =
      current.textRenderingMode === TextRenderingMode.INVISIBLE;
    let i, glyph, width, spacingLength;
    if (isTextInvisible || fontSize === 0) {
      return;
    }
    this._cachedGetSinglePixelWidth = null;
    ctx.save();
    ctx.transform.apply(ctx, current.textMatrix);
    ctx.translate(current.x, current.y);
    ctx.scale(textHScale, fontDirection);
    for (i = 0; i < glyphsLength; ++i) {
      glyph = glyphs[i];