The EVs have surface proteins present on their surface via which the IgG will bind. This interaction is an antigen-antibody interaction. All antigen-antibody bonds are weak physical bonds. The forces involved are not strong covalent bonds but rather they are weaker bonds such as electrostatic interactions, hydrogen bonds, and the Van der Waals forces.
I came across the article attached below which may interest you.
As per the paper, in pancreatic ductal adenocarcinoma, IgG in circulation binds to the tumor neoantigens, melanoma associated antigen B1 (MAGE B1) on circulating EVs released by tumor cells.
Article IgG+ Extracellular Vesicles Measure Therapeutic Response in ...