Ummm...I suppose but what is your goal?
Malt extract is for makign beer, not hard cider. if you add LME or DME to cider, it won't be cider anymore...but some kind of fusion of cider and beer.
it may taste great...it may taste like donkey taint.
So, why are you thinking of trying this? And if you do, I would boil the extract for 10 minutes to make it sanitary. No need to go the full hour.
Primary: English Mild
On tap: Pale Ale, Lancelot's Wheat, English Brown Ale, Steam Beer, HoovNuts IPA
Bottled: MOAM, Braggot, Raspberry Melomel, Merlot, Apfelwein, Pyment, Sweet mead, Cabernet
Gal in 2009: 27, Gal in 2010: 34, Gal in 2011: 13, Gal in 2012: 10