Software designed by Power agents to plant files on a computer network to ease the acquisition of systems.
— In-Game Description
Power Injection Malware is a type of Data in Elite Dangerous: Odyssey. It can be obtained from Power contacts in any Fortified or Stronghold systems controlled by a commander's Power and used at settlement Data Ports in Acquisition systems.
A single upload can be performed on each data port within a settlement per instance, taking 60 seconds and rewarding 372 merits upon completion.

Photo where it indicates the cost of the merits obtained (372) by uploading a Power Injection Malware in a system under acquisition
They are considered illegal items, and NPC personnel will react negatively if they detect the player holding or using one.