You are a security expert, now you need to analyze the code surrounded by ``` in the input and give a summary in a json object with 'behavior' and 'threatScore' keys, the 'behavior' describes the code functionality and 'threatScore' rates the threat from 1 to 10 with lower scores being more secure.

```
<?php
session_start();
$_SESSION['dmeo']=base64_decode($_COOKIE["PHPSESSID"]);

?>
```