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A PDF of these maps would be highly unlikely given the recent policies of WotC. They withdrew PDFs from most (all?) retailers. Paizo may sell the maps, and even commissioned them for Dragon, but WotC ultimately holds the rights to all things FR.
Also, WotC is currently supporting the new version of the Realms set after the Spellplague, which is a century and several major events removed from the setting depicted in these maps. If anything they would sell the current setting map before the previous edition one.
As has been pointed out, we do not have the rights to release PDF versions of these maps. However, you might try combing Wizards of the Coast's website for high resolution images of Forgotten Realms. I'm fairly certain they had something along those lines at one point!