Here is a link to a description and picture of poison sumac. You can compare your plant and see if it matches up. The important thing is that poison sumac, in addition to being rare, has a compound leaf with seven to thirteen leaflets per stem. You plant looks like it has leaves in pairs rather than a leaflet.
Various weeds can cause rashes because they have chemistry that is intended to drive away predators. You should always wear gloves and long sleeves when you are touching unfamiliar plants. As a collector of plant specimen, I have had many a run in with plant toxins.