Hi, @Pil0t_Pete. If you search the community for PDF.js you’ll see more reports very like this, though as you point out none seem to offer an outright fix, and the answers from Brave people suggest it’s a coding issue. Is this correct @Mattches?
So, until the coding is corrected, you could try turning off use of the internal PDF viewer and download the PDFs, then view them with Adobe Reader or something. If that’s what you’re doing and getting the error, then I’m out of ideas. To change Brave’s settings,
Related threads (some of them):