There was a given pdf file with the challenge.
![image](https://github.com/jeromepalayoor/ctf-archive-hub/assets/63996033/9ab13d24-f939-434b-89bd-0055ec561e6b)
Thanks to the hint, it is caesar cipher.
![image](https://github.com/jeromepalayoor/ctf-archive-hub/assets/63996033/e89c26bd-e20d-46c3-8612-8470ec2bb6a9)
So decrypting the small part.
![image](https://github.com/jeromepalayoor/ctf-archive-hub/assets/63996033/3c8a160c-8aff-438e-9fd7-6737259d0e01)
Flag: `flag{CaesarCiphersAreCool}`