The urgent need in using more sustainable materials brought with it the possibility of adding agro-industrial residues and natural fibers in the composition of polymeric compounds. Thus, the objective of this work was to study the feasibility of using vegetal waste, obtained after the chocolate manufacturing process, as filler for polymeric composites from recycled polyolefins, such as PP and HDPE. The cocoa residue flour has the potential to be used as a vegetal filler in polymeric composites, since it provides increased stiffness and gives a characteristic odor of chocolate to the parts produced, as shown in our previous work. Thus, the focus of this study was to evaluate the occurrence of biodegradation in the composites produced. The first step was the isolation of microorganisms living in intimate association with the cocoa, since these organisms have potential for degradation of the cocoa fibers and use them as a source of nutrients in nature. In total, five different microorganisms were isolated from fruit pods of cocoa in natura. After evaluation, the fungus identified as C4 presented better development in contact with composites and was then subjected to further studies using scanning electron microscopy (SEM), density and tensile test. The results of the analysis indicated that the microorganisms have damaged the structure of the composites and have grown mainly around its dispersed phase (cocoa particles). This strong interaction of the fungus with cocoa particles caused variations in physical properties measurements, proving partial degradation caused by microorganisms. That way, there has been success in finding a microorganism capable of biodegradate, although partially, polyolefins composites with cocoa. In the next steps of our study, we plan to comprehend the biodegradation mechanisms operating as well as to evaluate the effect of different variables such as filler content, exposure time, among others.