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)


this._transformStack.push(old);
      this._transformMatrix = old.slice(0, 6);
      this._originalSave();
    };
    ctx.restore = function ctxRestore() {
      const prev = this._transformStack.pop();
      if (prev) {
        this._transformMatrix = prev;
        this._originalRestore();
      }
    };
    ctx.translate = function ctxTranslate(x, y) {
      const m = this._transformMatrix;
      m[4] = m[0] * x + m[2] * y + m[4];
      m[5] = m[1] * x + m[3] * y + m[5];
      this._originalTranslate(x, y);
    };
    ctx.scale = function ctxScale(x, y) {
      const m = this._transformMatrix;
      m[0] = m[0] * x;
      m[1] = m[1] * x;
      m[2] = m[2] * y;
      m[3] = m[3] * y;
      this._originalScale(x, y);
    };
    ctx.transform = function ctxTransform(a, b, c, d, e, f) {
      const m = this._transformMatrix;
      this._transformMatrix = [
        m[0] * a + m[2] * b,
        m[1] * a + m[3] * b,