This is my jungling malphite build. It works for a jungling nasus too.
1. You usually want to start with,
Cloth + 5 health potions
2. Either your team and you clear dragon or it helps you get golem. If you clear dragon, 1 other player should help you with golem or lizard. Malphite needs a buff to jungle quickly at low levels.
Facts behind this build.
-The armor penetration Marks help you soloing the golem and lizard, they have 24 armor.
-The armor from runes is also extra damage on your E ability.
-The utility tree is a must. You benefit from a 30% extension on neutral buffs, extra movespeed to gank and a -15% cooldown reduction on smite.