Oh, and if anyone needs to do something similar, and they're not worried about PDF versions (ie, it's not for prepress work), there's an Automator action (Split PDF), or you can use AppleScriptObjC. The main advantages of these methods are (a) you don't need Acrobat Pro, and (b) they're much, much faster. Here's an example of the latter:
use scripting additions
use framework "Foundation"
use framework "Quartz" -- required for PDF stuff
set inPath to POSIX path of (choose file with prompt "Choose a PDF file:")
set folderPath to POSIX path of (choose folder with prompt "Choose a folder to save the separated pages to.")
its splitPagesInPath:inPath savingInFolder:folderPath
on splitPagesInPath:inPath savingInFolder:folderPath
-- make URL of the PDF
set inNSURL to current application's class "NSURL"'s fileURLWithPath:inPath
-- get name of PDF
set docName to inNSURL's lastPathComponent()
-- make URL of output folder
set outFolderNSURL to current application's class "NSURL"'s fileURLWithPath:folderPath
-- make PDF document from the file
set theDoc to current application's PDFDocument's alloc()'s initWithURL:inNSURL
-- store media bounds of page 1; unnecessary in most cases
set theBounds to (theDoc's pageAtIndex:0)'s boundsForBox:(current application's kPDFDisplayBoxMediaBox)
-- count the pages
set theCount to theDoc's pageCount() as integer
repeat with i from 1 to theCount
-- build new document's name
set newDocName to (its addString:("-" & i) beforeExtensionIn:docName)
-- make URL for new PDF
set outNSURL to (outFolderNSURL's URLByAppendingPathComponent:newDocName)
-- get page of old PDF
set thePDFPage to (theDoc's pageAtIndex:(i - 1)) -- zero-based indexes
-- set media bounds if you stored it above
(thePDFPage's setBounds:theBounds forBox:(current application's kPDFDisplayBoxMediaBox))
-- make new PDF document
set theNewPDFDocument to current application's PDFDocument's alloc()'s init()
-- insert the page
(theNewPDFDocument's insertPage:thePDFPage atIndex:0)
-- save the new PDF
(theNewPDFDocument's writeToURL:outNSURL)
end repeat
end splitPagesInPath:savingInFolder:
on addString:extraString beforeExtensionIn:aPath
set aString to current application's NSString's stringWithString:aPath
set newString to current application's NSString's stringWithFormat_("%@%@.%@", aString's stringByDeletingPathExtension(), extraString, aString's pathExtension())
return newString as text
end addString:beforeExtensionIn: