PDF with garbled text after editing on a Mac

Hi all, hope someone can help. I'm struggling to get to the bottom of a very bizarre issue. I have a number of PDFs that were originally created using ABBYY's FineReader OCR software. They display fine, and I can "copy" text from the documents to the clipboard with no issues.
However, as soon as I bring them over to the Mac side and make a change to the document using OS X's Preview, things go wrong. As soon as any changes are made, I can no longer copy text from the document to the clipboard - the text that ends up on the clipboard is garbled. However, the display text is still perfectly legiable.
For example. here's a link to a very simple and basic PDF document, that was originally a perfectly fine PDF but became mangled.
Broken PDF
Using Acrobat I've removed all the graphics and most of the text from the document, leaving just a single text box ("AUTUMN SPECIAL!").
So if I highlight the text on the page which reads:
AUTUMN SPECIAL!
what ends up on the clipboard is:
*)﴿*%& (﴾'"!# $  
I've done a whole ton of reading about the internals of PDFs and I'm pretty certain that this is something to do with the CMAP character-to-glyph mappings; but I've no idea what to do to fix it. Acrobat's PreFlight check for the PDF/A 2a standard tells me:
"Text cannot be mapped to Unicode"
"Type 2 CID font: CIDToGIDMap invalid or missing"
Also, an inventory report (available here) shows the letter "A" being mapped to a space, letter "C" to a exclamation mark etc - all obviously wrong. However, "Analyze and Fix" won't fix the problem
Does anyone have any advice on how to fix this? I know it's definitely a bug somewhere on the Mac side and the obvious answer would be to avoid editing documents using OS X Preview, but unfortunately I have several hundred documents in this state. Is there any way to fix the mapping, or otherwise return the text to a state where it can be accurately copied from the document?
Thanks very much in advance for any help or advice given.

I doubt you could fix this. Generally a "garbled" file is considered unusable for copying, and that's that. If a PDF uses random mappings instead of standard ones it looks fine on screen, but text extraction is impossible.
Short of converting every page to bitmap and OCRing again.

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