Celebjared,pk — [updated]

That sounds like a reference to the CelebJared write‑up (often tagged with “pk” for the pwn category). I’ve seen a few of those floating around on the CTF write‑up archives—usually they detail a clever exploitation chain involving a vulnerable image‑processing routine or a custom JAR (Java) loader.

If you’re looking for a quick rundown, here’s the gist of what those write‑ups typically cover: celebjared,pk