This file is not rendered correctly in pdf.js (the gradient background).
I created it from a standard Google docs' template.
Reproducable, FF20, Mac OSX, latest PDF.js
Still an issue using Windows 7 x64, Firefox 22 (HWA on) and the pdf.js development build. Nothing indicating a bug in the console.
Since the PDF file is no longer available, I'm closing this issue as incomplete.
(We will be happy to re-open the issue if a new link to the PDF file is provided.)