Windows Runtime PDF Renderer Library, WinRT PDF are all affected. This is the integrated PDF viewer of Edge and is also the default PDF syntax for Windows Reader App, the default PDF viewer on Windows 8 onwards.
Similarly, open source PDF syntax like Ghostscript and QPDF is also affected, meaning there will be many PDF viewing applications on the desktop and the web using the two tools affected. Böck reported a bug to affected products and the patch will be released soon.
Adobe Reader and the integrated PDF viewer on OS X are still safe.
The researcher said he used the fuzzing library for analysis. Fuzzing is a basic security testing technique that uses a lot of random input data and analyzes the output of the output and finds anomalies. Google's security experts use this technique very often and encourage people to use it.
Böck also blames administrators for not running test suites. This is a collection of problematic files that the viewer can still open without crashing. Most perfect, the software developer must not release a new version of the application without running a successful test suite.