Add pumpkin, beans, maple syrup, vanilla extract, salt, pumpkin pie spice, and almond butter to food processor or high-powered blender. Puree for 20 seconds, then stop and scrape down sides. Puree for another 40 seconds, then scrape down sides.
Add coconut butter, and puree for 30 seconds to bring everything together until completely smooth. Scrape into a 8" x 4" x 2 1/2 inch loaf pan (a little smaller or bigger will work too, it will just affect the thickness of your fudge) and smooth top with a spoon. Sprinkle pecans on top, then lightly press down on them so they attach to fudge.
Freeze for 1 hour, then cut into small squares and serve. You can store leftovers in covered container in the freezer or refrigerator, for 2 weeks. Storing in refrigerator will result in a little softer fudge.