Antimicrobial resistance remains a major challenge in the treatment of bacterial infections worldwide, particularly because certain pathogenic bacteria can form biofilms that enhance antibiotic resistance. Methicillin-resistant Staphylococcus aureus (MRSA) is one of the most clinically significant antibiotic-resistant bacteria, with biofilm formation contributing to persistent infections and reduced therapeutic efficacy. Therefore, the exploration of medicinal plants as alternative sources of antibiofilm agents has become increasingly important. This study aimed to evaluate the antibiofilm activity of three parts of Tigarun (Crataeva magna (Lour.) DC.), a native medicinal plant from Borneo, against MRSA and to investigate the potential metabolites associated with its activity through metabolomic analysis. Leaf, bark, and flower extracts of C. magna were obtained using ultrasound-assisted extraction. Antibiofilm activity against MRSA ATCC 33591 was evaluated using a spectrophotometric microplate assay. Metabolomic profiling was conducted using Fourier-transform infrared (FTIR) spectroscopy combined with multivariate statistical analysis to identify metabolite groups that may be responsible for the antibiofilm activity. The results demonstrated that the leaf and flower extracts exhibited strong antibiofilm activity against MRSA biofilms, with IC₅₀ values of 52.88 ± 5.77 µg/mL and 49.30 ± 5.23 µg/mL, respectively. In contrast, the bark extract showed weaker activity, with an IC₅₀ value exceeding 100 µg/mL. FTIR-based metabolomic analysis and multivariate modeling indicated that phenolic and flavonoid metabolites were strongly associated with antibiofilm activity. These findings suggest that C. magna, particularly its leaf and flower extracts, has promising antibiofilm potential against MRSA and may serve as a valuable natural resource for developing alternative antimicrobial agents targeting biofilm-associated bacterial infections.