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Was it a cool day? I suspect the fluid in the exhaust was simply condensation from hot, humid exhaust (water vapour is a byproduct of combustion) hitting cold metal. The dark colour would come from the exhaust particulates that are stuck to the inside of the exhaust.
"Leaking" from where you noticed might not be a problem, many bike mufflers aren't perfectly sealed to the pipe. Some of them literally slip over the pipe and are held in place with a couple of springs to allow the muffler and pipe to slide due to thermal expansion.
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