Attach (recommended) or Link to PDF file here:
[Test file.pdf](https://github.com/mozilla/pdf.js/files/4656226/Test.file.pdf)

Configuration:
- Web browser and its version: Chrome Version 81.0.4044.138 (Official Build) (64-bit)
- Operating system and its version: Windows 10
- PDF.js version: latest
- Is a browser extension: no

Steps to reproduce the problem:
1. Open [https://mozilla.github.io/pdf.js/web/viewer.html](https://mozilla.github.io/pdf.js/web/viewer.html)
2. Load the provided .pdf file

What is the expected behavior? (add screenshot)
![image](https://user-images.githubusercontent.com/5569382/82438616-02c3fe80-9aa2-11ea-9003-b75ea1e7aac6.png)

What went wrong? (add screenshot)
![image](https://user-images.githubusercontent.com/5569382/82438640-09527600-9aa2-11ea-810b-071da7e37896.png)


get: function getCurrentTransform() {
        return this._transformMatrix;
      },
    });
    Object.defineProperty(ctx, "mozCurrentTransformInverse", {
      get: function getCurrentTransformInverse() {
        
        
        
        const m = this._transformMatrix;
        const a = m[0],
          b = m[1],
          c = m[2],
          d = m[3],
          e = m[4],
          f = m[5];
        const ad_bc = a * d - b * c;
        const bc_ad = b * c - a * d;
        return [
          d / ad_bc,
          b / bc_ad,
          c / bc_ad,
          a / ad_bc,
          (d * e - c * f) / bc_ad,
          (b * e - a * f) / ad_bc,
        ];
      },
    });
    ctx.save = function ctxSave() {
      const old = this._transformMatrix;