This phase I/II trial studies the side effects and best dose of M3814 and to see how well it works when given together with radiation therapy in treating patients with pancreatic cancer that cannot be removed by surgery and has not spread to other parts of the body (localized). M3814 may stop the growth of tumor cells by blocking some of the enzymes needed for cell growth. Hypofractionated radiation therapy delivers higher doses of radiation therapy over a shorter period of time and may kill more tumor cells and have fewer side effects. Giving M3814 and hypofractionated radiation therapy together may work better than radiation therapy alone in the treatment of patients with localized pancreatic cancer.