brown recluse spider
The animal you are referring to is the hobo spider (Tegenaria agrestis). It is not actually considered aggressive, but its bite can be venomous, although not usually fatal. Make sure to exercise caution when interacting with this species.
a poisonous spider
The Brown Recluse spider.
Brazilian Brown Spider
The two types of poisonous spiders in New Mexico of the Black Widow and the Brown Spider. The blanca, desert, and Apache are all species of Brown Spider.
The Funnel Web Grass Spider. They live in the grass mostly and are poisonous but are not aggressive spiders.
Only a few species are seriously poisonous to humans. There are these few Spiders: black widow, African brown spider, bird spider, and if you ever see a spider with a violin shape on its back stay clear this spider can kill and is known for it. *Edit: The violin spider (or Brown Recluse, Loxosceles Reclusa, or Fiddleback spider) mentioned above is NOT deadly. It is difficult for doctors to diagnose spider bites, and the bite of this particular spider looks very similar to other serious conditions, so a lot of pictures/stories you see/hear about this spider being deadly are false. Though not deadly, this spider does cause very serious wounds and should be avoided. It is not aggressive.
One of the two spiders that are native to NM and is considered poisonous is the widow spider. Also, the recluse spider is another NM spider that is poisonous.
a brown recluse is way more deadly than a widow.
Based on your description, the spider you found could be a brown widow spider (Latrodectus geometricus). It is important to note that without a photo or more details, it is difficult to provide a definitive identification. If you suspect it may be a venomous species like a widow spider, it's best to exercise caution and contact a professional for removal if needed.
The most very very very poisonous animal is a brown recluse spider
The Funnel Web spider is the most poisonous.