Doran, Robert, and Harold W. Attridge. 2 Maccabees: A Critical Commentary. Hermeneia–a Critical and Historical Commentary on the Bible. Minneapolis, MN: Fortress Press, 2012.
An excellent commentary on 2 Macc, provides a solid general introduction and a terse but informative line-by-line commentary.
Goldstein, Jonathan A. II Maccabees: A New Translation with Introduction and Commentary. Nachdr. The Anchor Bible 41A. New Haven: Yale University Press, 2008.
Another excellent commentary, more detailed in both the notes and the introduction than Doran’s.