password

Hi guys, I'm quite new to the encryption/decryption of crypted files/ text. Can someone explain to me how to decrypt text which was encrypted with the PBKDF2 & SHA256 standard? The text I have for example looks like this: pbkdf2_sha256$20000$eAhST7tafHP8$ZZLFt3d8hfR5STF7ZNLEGtnNSbYueCdxrWlHbisLUk=