128 bit RC4 encrypted pdf file decryption

Published: 13/08/2017
128 bit RC4 encrypted pdf file decryption
Source: CRYPTO.STACKEXCHANGE.COM

I have a 128 bit RC4 encrypted pdf file, the password of which I had set 4 years ago and I really don't remeber it anymore. I tried brute force on it using pdfcrack on an i5-4200M processor. I have been running the bruteforce on a 2GB memory 2 vCPU digitalocean VM for the past 24 hours with no luck. Any suggestions on software or hardware to use. if parallel processing can be of my help using mul

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