Unassigned by IANA and rarely seen — if it is open, something on the host chose it deliberately.
IANA lists 8992–8996 as Unassigned, so 8994 carries no service name and no expectations. There is no well-documented application or malware family that habitually uses it. The only way to know what is there is to find the listening process locally or fingerprint the service on the wire.
Expose with care
Nothing about the port number justifies exposure; decide after you know what answers on it.
$ sudo lsof -nP -iTCP:8994 -sTCP:LISTENSeen this on your network? Beige Box scans your Wi-Fi and shows every open port on every device — and its Ports tool links straight back here.
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Corrections or a missing port? Reply @rimrocksystems.