The Fedor Sinitsyn, a senior malware analyst at Kaspersky Labs, has discovered a weakness in the Jaff Ransomware. He was able to release a decryptor for all variants that have been released to date. This decryptor can recover your files for free using the RakhniDecryptor. Even though your files are now decrypted, the original encrypted files will still be on your computer. If you have any questions or need support in decrypting your files, please feel free to post.
Source: https://www.bleepingcomputer.com/news/security/decrypted-kaspersky-releases-decryptor-for-the-jaff-ransomware/