halloween.zip is a release file of the Minecraft resource pack Faithful 32x Halloween Add-on, made for Minecraft 1.8. It was published on October 6, 2014 and is 1.5 MB in size. For the full description, screenshots and every other version, visit the Faithful 32x Halloween Add-on resource pack page.
How to install: Put the .zip into .minecraft/resourcepacks (do not extract it) and enable it under Options → Resource Packs.