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@thestinger thestinger released this Aug 20, 2019 · 3 commits to master since this release

Full list of changes from the previous release (version 1). Notable changes:

  • add document rotation actions
  • add skip to first/last page actions
  • add immersive mode with entry / exit on single tap
  • substantial PDF rendering compatibility and performance improvements

This release will be bundled with the next release of GrapheneOS and is also being pushed out via the Play Store.


Simple Android PDF viewer based on pdf.js and content providers. The app doesn't require any permissions. The PDF stream is fed into the sandboxed WebView without giving it access to content or files. Content-Security-Policy is used to enforce that the JavaScript and styling properties within the WebView are entirely static content from the apk assets. It reuses the hardened Chromium rendering stack while only exposing a tiny subset of the attack surface compared to actual web content. The PDF rendering code itself is memory safe with dynamic code evaluation disabled, and even if an attacker did gain code execution by exploiting the underlying web rendering engine, they're within the Chromium renderer sandbox with no access to the network (unlike a browser), files, or other content.

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