• we given flag.docx.zip ;

• unzip flag.docx.zip will result in flag.docx.

• However, look at the results of file flag.docx

flag.docx: XZ compressed data, checksum CRC64

• I’ve renamed the file to flag.docx.xz and used xz -d flag.docx.xz to decompress it.

• This time, file flag.docx returns POSIX tar achive

• Rename the file to flag.tar and decompress using tar xf flag.tar.

• We’re given a flag.txt containing the flag.