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 dict = isStream(shading) ? shading.dict : shading;
    const type = dict.get("ShadingType");
    try {
      switch (type) {
        case ShadingType.AXIAL:
        case ShadingType.RADIAL:
          
          return new Shadings.RadialAxial(
            dict,
            matrix,
            xref,
            res,
            pdfFunctionFactory,
            localColorSpaceCache
          );
        case ShadingType.FREE_FORM_MESH:
        case ShadingType.LATTICE_FORM_MESH:
        case ShadingType.COONS_PATCH_MESH:
        case ShadingType.TENSOR_PATCH_MESH:
          return new Shadings.Mesh(
            shading,
            matrix,
            xref,
            res,
            pdfFunctionFactory,
            localColorSpaceCache
          );
        default:
          throw new FormatError("Unsupported ShadingType: " + type);
      }