Your aluminum MacBook is running High Sierra, which is 2 generations newer than Apple supports.
AFAIK, the 007D.B03 is apparently the latest for your Macbook5,1 - but reporting software, such as Silent Knight, reads your patched system incorrectly.
It's one of the "hazards" of running a patched system on an older Mac.
Reporting software will continue to report that anomaly, but there's likely nothing that you can do about that, until Apple provides an actual firmware update for your 2008 MacBook (And that won't happen now)