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1.
From the RPG Shadowrun. Used also as " runner'.

Somebody who receives wages from:

- international corporations
- crime organisations
- independant people claiming revenge... or something else
- others

To:

- Steal data / objects
- " Extract" ( see "extraction" later) somebody
- kill somebody
- sabotage corporate/ private installations

Somebody who performs a shadowrun .
this day and age, things change so fast that the centrifugal force of progress will shear your head right off. Shadowrunners like us need to keep up with the latest developments. When you run a B&E, you need to know what nasty new security feature might try to cut you in two as much as you need to know which nova new magic formula is worth snatching. It's the state of the art, chummer-it'll make you cred or get you dead."

State of the Art 2063
by Boomer March 25, 2005
 
2.
A group of kids/people who run "errands" for people in the cover of shadows hence the name SHADOW Runners while staying out of sight they keep away from crowds and off main roads the faces of these brave men/women/children are never to be seen we wear dark clothing and our symbol is in/on ask.com type in "what is a shadow runner"
the lead Shadow Runners commander gave his crew of runners a mission to deliver a message to they're target without being seen
by The Shadow Runner Organization March 01, 2011