I'm sorry if it's a duplicate, I found lots of issues with gradients but none of the open ones looks similar.
It's apparently the PDF code `/Matrix [440 0 0 -200 20 220]` (line 44 in both files) that causes the problem.

**Configuration:**
- Web browser and its version: Chrome 54
- Operating system and its version: Windows 10
- PDF.js version: 1.6.343

**Steps to reproduce the problem:**
Open attached files:
[radial.pdf](https://github.com/mozilla/pdf.js/files/610302/radial.pdf)
[linear.pdf](https://github.com/mozilla/pdf.js/files/610300/linear.pdf)

**What is the expected behavior?** (Adobe Reader 11)
![image](https://cloud.githubusercontent.com/assets/17966696/20583379/fa80d780-b1f1-11e6-85d2-62dd6970a08c.png)

**What went wrong?** (mozilla.github.io/pdf.js/web/viewer.html)
Gradients aren't correctly transformed
![image](https://cloud.githubusercontent.com/assets/17966696/20583361/cf5bb8a4-b1f1-11e6-9479-9cc606b41187.png)

const absDet = Math.abs(m[0] * m[3] - m[2] * m[1]);
        const sqNorm1 = m[0] ** 2 + m[2] ** 2;
        const sqNorm2 = m[1] ** 2 + m[3] ** 2;
        const pixelHeight = Math.sqrt(Math.max(sqNorm1, sqNorm2)) / absDet;
        if (
          sqNorm1 !== sqNorm2 &&
          this._combinedScaleFactor * pixelHeight > 1
        ) {
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          this._cachedGetSinglePixelWidth = -(
            this._combinedScaleFactor * pixelHeight
          );
        } else if (absDet > Number.EPSILON) {
          this._cachedGetSinglePixelWidth = pixelHeight;
        } else {
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          this._cachedGetSinglePixelWidth = 1;
        }
      }
      return this._cachedGetSinglePixelWidth;
    }
    getCanvasPosition(x, y) {