Brake Fluid Leak at Bottom of ABS

[Heineken]

When checking my garage today I noticed suspicious marks on the concrete floor.
As the front right of the NSX is free of the typical fluids found in front engine cars (like oil, power steering fluid and the like) the first thing I checked was the ABS brake fluid level.
It was near the 'low' mark even though I remembered it to be at 'full' mark about a year ago ..

The brake fluid at the master cylinder was perfectly fine, though.

Looking under the car, the drops on the floor were exactly below the lower mounting bracket of the ABS unit and the bracket was wet:



Before trying to disassemble everything I wanted to ask if it might be a familiar issue as it strikes me a little odd as of where the bracket is wet (all up to the mounting bolts) and that it seem to have no effect whatsoever on the master cylinder fluid level.

PS: The ABS was not exercised recently but could it be an overflow-during-pump-run issue?