SAKURA Internetから不正アクセス？

自宅のサーバのログに次のような記録がありました。
PHPの脆弱性を突いたアクセスだそうです。
IPアドレスを調べるとレンタルサーバなとで有名なサクラ・インターネットでした。

Access Log

59.106.22.214 - - [09/Mar/2008:22:45:30 +0900] "GET /a1b2c3d4e5f6g7h8i9/nonexistentfile.php
HTTP/1.0" 403 236 "-" "-"
59.106.22.214 - - [09/Mar/2008:22:45:30 +0900] "GET /adxmlrpc.php
HTTP/1.0" 403 210 "-" "-"
59.106.22.214 - - [09/Mar/2008:22:45:30 +0900] "GET /adserver/adxmlrpc.php
HTTP/1.0" 403 219 "-" "-"
59.106.22.214 - - [09/Mar/2008:22:45:30 +0900] "GET /phpAdsNew/adxmlrpc.php
HTTP/1.0" 403 220 "-" "-"
59.106.22.214 - - [09/Mar/2008:22:45:30 +0900] "GET /phpadsnew/adxmlrpc.php
HTTP/1.0" 403 220 "-" "-"

Error Log

[Sun Mar 9 22:45:30 2008] [error] [client 59.106.22.214] client denied by server
configuration: /a1b2c3d4e5f6g7h8i9
[Sun Mar 9 22:45:30 2008] [error] [client 59.106.22.214] client denied by server
configuration: /adxmlrpc.php
[Sun Mar 9 22:45:30 2008] [error] [client 59.106.22.214] client denied by server
configuration: /adserver
[Sun Mar 9 22:45:30 2008] [error] [client 59.106.22.214] client denied by server
configuration: /phpAdsNew
[Sun Mar 9 22:45:30 2008] [error] [client 59.106.22.214] client denied by server
configuration: /phpadsnew