This is a Phase 2, open-label, multicenter, single-arm study to evaluate the efficacy, safety, and pharmacokinetics (PK) of nuzefatide in adult participants with metastatic pancreatic ductal adenocarcinoma (PDAC) whose disease has progressed on or after one prior line of systemic therapy in the metastatic setting or on or after second line therapy with a KRAS inhibitor in the metastatic setting. Nuzefatide is a novel Bicycle® drug conjugate (BDC®) that targets EphA2, a protein often found on cancer cells, and delivers a potent anti-cancer agent (MMAE).