Curious if anyone can tell what this is? Not sure if it's mold or if it is something else.

The yellow in the closeup is sap I believe but the black stuff almost looks like super small poppy seeds.

[![Attic Pic 01](https://i.stack.imgur.com/Cxft1.jpg)](https://i.stack.imgur.com/Cxft1.jpg)

[![Close Up of attic board](https://i.stack.imgur.com/uIuZ4.jpg)](https://i.stack.imgur.com/uIuZ4.jpg)