Greetings, 

From what we see here, this bug is very likely a brown marmorated stink bug. This is the very common stink bug that you are probably used to seeing in Oregon, simply a younger version of it. Stink bugs can cause damage to plants, most notably fruit trees. If the plant these bugs were found on is indeed a fruit tree, then you'll likely want to take action to prevent their spread. You can either make a sticky "pheromone trap" to lure them in (making sure to also destroy the eggs left behind on the plants), or by purchasing predatory insects to hunt the stink bugs (see the attached link for effective species of predators).

If you let us know what kind of plant the bug is on, we can provide more details as to control measures for the stink bug.

Ways to control brown marmorated stink bugs | Washington State University (species of predators and pheromone traps listed here)Additional Info on BMSB | PNW Handbooks
Please let us know if you have any other questions,

Casey, Trainee, Benton County Master Gardener Volunteers

Elizabeth Records (she/hers)
Education Program Assistant 2
Community Horticulture &
Master Gardener Volunteer Program
Oregon State University Extension Service
Linn & Benton County