It looks like there were water problems at the corner. The radiators were leaking? Make sure there are no ongoing moisture issues with the pavement. Cover the area with plastic taped at the edges and see if you get any condensation underneath. I'm not a big fan of mold testing.
source https://www.inspectorsjournal.com/topic/18833-black-glue-on-concreteis-it-dangerouscan-i-leave-it/?do=findComment&comment=172347
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