The PDF viewer in Google Chrome before 46.0.2490.86 does not properly restrict scripting messages and API exposure, which allows remote attackers to bypass the Same Origin Policy via an unintended embedder or unintended plugin loading, related to pdf.js and out_of_process_instance.cc.
The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.