Depends what you mean by “demon” but yes. The astral is full of entities benevolent to predatory. The existence of the parasitic and predatory kinds is why we put up wards and shields, to disallow them access to our energy while allowing through those entities we feel are beneficial to work with.
As above so below.
This is the appropriate response, imo. Kill it with fire before it lays eggs.
We have a bunch of info on what we call “parasites” here:
More on keeping good spiritual hygiene (literally, think not having lice or fleas eating you) here:
Kill it with fire before it lays eggs.