The update 9.3 of pdf Toolbox from Callas adds a new feature for the color separation of CMYK and spot color pages. This sounds like a déjà vue. In the late 1990ies color separation of PDF pages was a huge topic. (I was working on a software solution myself.) But it seams that there is still a need. Just recently I had such an enquiry. The customer would like to check separations on the monitor and print them on a laser printer if necessary.
During the first test I recognized a mess with the separation names in the page label fields when the PDF had multiple pages. I have reported the bug to Callas and after a two weeks the problem was fixed in an update. Therefore you should update to version 9.3.434.