1 Correct answer
This script does what you're asking for.
https://www.marspremedia.com/software/indesign/pdf-export-single-pages
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You could also script renaming from the finder. The AppleScript below will add zeros to any files selected in the Finder that start with numbers 1-99. Test on a small number of files in Mojave—I'm using HS
tell application "Finder"
try
set the s to the selection
end try
set p to {"1", "2", "3", "4", "5", "6", "7", "8", "9"}
repeat with x in s
set n to name of x
set n2 to characters 1 thru 2 of n
if item 1 of n2 is in p and item 2 of n2 is in p then
set name of x to "0" & n
else if item 1 of n2 is in p then
set name of x to "0" & n
end if
end repeat
end tell
Thanks for the script, rob! Might be a basic solution but it would need a few more steps to get the job done.
And thanks for the tip, jmlevy, however that product looks a lot more simple and basic than Output Factory while it costs more than twice as much. I'll keep it in mind though. 
The files will be sequentially numbered coming from Acrobat. View them by file name in order in Bridge and Bridge will follow the same numbering.
IDEAS-Training That three digit option is interesting but the sequential numbering isn’t. I need the number to be the same as the actual page number. Suppose I made a pdf of pages 25 to 35: this option will renumber them to 1 to 10. This option might be interesting if I made a pdf of ALL pages in one go, but that won’t happen too often.
@Stephen_A_Marsh Sounds interesting!
@rob day Understood but I still don’t know how to script the prefixes. I didn’t only need the zero’s.
(Why don’t Stephen en rob show up as selectable option when I type @...?
IDEAS-Training Ah, that helps but I also usually skip quite a few pages when creating pdf’s so what if I made pdf’s of pages 52, 58, 64 And so on? In that case I might as well renumber them manually. But okay, the option has become more interesting.
@Stephen_A_Marsh Filenames would be (exact real world examples after creating them with InDesign):
Visie 01-2019_1.pdf
Visie 01-2019_42.pdf
Visie 01_2019_112.pdf
And they would have to become:
001_Visie 01-2019.pdf
042_Visie 01-2019.pdf
112_Visie 01-2019.pdf
And as I explained above I won’t always have ALL pages available as pdf. Out of for instance 128 pages I probably will have to pdf 75 pages.
First off, I think Rob’s approach is best to have the export create the names as required. The caveat being that this is Mac OS only for Rob’s script. This could likely be scripted for MS Win OS or in a cross platform InDesign JavaScript.
OK, I believe that I have a workable solution in Bridge. Pro – it is cross platform, Con – It requires a second workflow step. The batch rename settings can be saved for future use:
To save you work reproducing the regex from the screenshot (not to mention that it is truncated), here it is ready for copy paste:
Original Filename
Find: (^.+)(?:_)(\d{1,3})
Replace: $2_$1
Intermediate Filename
Find: (^0)(0\d{2}_.+)|(^00)(\d{3}_.+)
Replace: $2$4
________________________
Note: Here is a slightly refined alteration, moving the addition of the double zero padding into the regex replace and removing it as a separate text string entry from the GUI:
Original Filename
Find: (^.+)(?:_)(\d{1,3})
Replace: 00$2_$1
There are likely minor refinements that can be made to the regex, I’ll probably let that go for now.
________________________
P.S. My grey matter is somewhat challenged today, so I may come up with a better or simpler method once I am running on all cylinders!
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