Yes, after failing to kill Vice President Walden on two previous occasions -- the first having been foiled when Brody chickened out and the second when Brody snitched to the CIA -- Nazir has decided to pursue the Plan Z of all Plan Z's: get Brody to steal the serial number to Walden's pacemaker so the aforementioned hacker can access the device and fatally fibrillate the old bastard.
And how exactly does Nazir know that Walden keeps this information on a bookshelf next to the treadmill in his home office at the Naval Observatory? "The New York Times, believe it or not," the wily old terrorist says. The writers are just laughing at us now, aren't they? (Oh, my mistake: Nazir is actually crediting the Times with teaching him how to hack a pacemaker.)