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 figure = mesh.figures[index];
    assert(figure.type === "patch", "Unexpected patch mesh figure");
    const coords = mesh.coords,
      colors = mesh.colors;
    const pi = figure.coords;
    const ci = figure.colors;
    const figureMinX = Math.min(
      coords[pi[0]][0],
      coords[pi[3]][0],
      coords[pi[12]][0],
      coords[pi[15]][0]
    );
    const figureMinY = Math.min(
      coords[pi[0]][1],
      coords[pi[3]][1],
      coords[pi[12]][1],
      coords[pi[15]][1]
    );
    const figureMaxX = Math.max(
      coords[pi[0]][0],
      coords[pi[3]][0],
      coords[pi[12]][0],
      coords[pi[15]][0]
    );
    const figureMaxY = Math.max(
      coords[pi[0]][1],
      coords[pi[3]][1],
      coords[pi[12]][1],
      coords[pi[15]][1]