Not sure if it's a dust attack or not because the sender could have sent less sats than 800 (546 if am not wrong).
Anyway, what makes things worse is that even the parent transaction of the one you received is still unconfirmed. So, if you are going to perform rbf you'll have to pay for both of them.

I haven't done an accurate calculation but I believe if you are going to use rbf to accelerate the transaction you'll need to add 80-90k sats to the paid fees to get a reasonable effective fee rate (~18 sat/vb)