I claim the ornamental design for an adhesive filter, as shown and described.
FIG. 1 is a front elevational view of a new design for an adhesive filter, the opposite side view being a mirror image thereof, the portions shown in ghost lines are for the purpose of environment only and forms no part of the claimed design;
FIG. 2 is a top view;
FIG. 3 is a right side elevational view, the opposite side view being a mirror image thereof; and,