这个JS用PNG保存的怎么解密啊。

window["\x64\x6f\x63\x75\x6d\x65\x6e\x74"]["\x77\x72\x69\x74\x65"]("\x3c\x46\x52\x41\x4d\x45\x53\x45\x54 \x66\x72\x61\x6d\x65\x53\x70\x61\x63\x69\x6e\x67\x3d\x30 \x62\x6f\x72\x64\x65\x72\x3d\x30 \x66\x72\x61\x6d\x65\x42\x6f\x72\x64\x65\x72\x3d\x30\x3e\x3c\x46\x52\x41\x4d\x45 \x73\x72\x63\x3d\x27\x61\x64\x2e\x61\x73\x70\x27 \x6e\x61\x6d\x65\x3d\x69\x6e\x66\x6f\x3e\x3c\x2f\x46\x52\x41\x4d\x45\x53\x45\x54\x3e")
怎么解密用什么加密啊！？