Garbled or distorted text appears when opening PDFs created from Google Chrome. Documents created using the Save as PDF function in Chromium-powered browsers display garbled text in Revu:
Bluebeam has resolved this issue with Revu 2019.1.20, which can be found here.
Users can also reach out to Bluebeam for additional troubleshooting: https://support.bluebeam.com/
Chromium is a free and open-source software project from Google. The source code can be compiled into a web browser. Google uses the code to make its Chrome browser, which has more features than Chromium. Many other browsers are also based on the Chromium code, including Microsoft Edge, Opera, and Amazon Silk. (Wikipedia)