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)

throw new Error(`bad image kind: ${imgData.kind}`);
    }
  }
  function putBinaryImageMask(ctx, imgData) {
    const height = imgData.height,
      width = imgData.width;
    const partialChunkHeight = height % FULL_CHUNK_HEIGHT;
    const fullChunks = (height - partialChunkHeight) / FULL_CHUNK_HEIGHT;
    const totalChunks = partialChunkHeight === 0 ? fullChunks : fullChunks + 1;
    const chunkImgData = ctx.createImageData(width, FULL_CHUNK_HEIGHT);
    let srcPos = 0;
    const src = imgData.data;
    const dest = chunkImgData.data;
    for (let i = 0; i < totalChunks; i++) {
      const thisChunkHeight =
        i < fullChunks ? FULL_CHUNK_HEIGHT : partialChunkHeight;
      
      
      let destPos = 3; 
      for (let j = 0; j < thisChunkHeight; j++) {
        let elem,
          mask = 0;
        for (let k = 0; k < width; k++) {
          if (!mask) {
            elem = src[srcPos++];
            mask = 128;
          }
          dest[destPos] = elem & mask ? 0 : 255;
          destPos += 4;
          mask >>= 1;