An Oracle with the haunted curse wants to use a bow (and is proficient with it). Does the act of drawing an arrow require the character to draw an arrow as a standard action?
No, Provided you're drawing it from a quiver
Retrieving any stored item from your gear requires a standard action, unless it would normally take longer.
When it is talking about stored gear, it's referring to things in your pack, like potions/books/torches/bedroll/whatever. "Retrieve a stored item" is usually a move action that provokes an AoO, and the Haunted curse makes it worse.
Further, Drawing/Nocking an arrow is covered by another action type:
Drawing an arrow (from the combat section):
Not an Action
Some activities are so minor that they are not even considered free actions. They literally don't take any time at all to do and are considered an inherent part of doing something else, such as nocking an arrow as part of an attack with a bow.