As a caution, please don't delete a file if you don't know exactly what file it is (i.e., you're the one that created the file). While deleting a PDF is probably harmless, other files may cripple your eDGe.

As for the .br folder, I'm not sure what (or where) that folder is. If it doesn't invade your privacy, can you list the names of two or three of these PDF files? It may help explain what they are.