Vulnerable versions of Adobe Flash are being actively exploited. Please patch your copy of Flash as soon as possible.

Title: Adobe Flash Releases Out-of-Band Flash Player Security Update
Description: Adobe has released an out-of-band security update for Flash Player in response to CVE-2017-11292, a zero-day vulnerability under active exploitation. CVE-2017-11292 manifests as a type confusion vulnerability. Reports have indicated that this vulnerability is being leveraged by the Black Oasis APT group. Users are advised to update as soon as possible to reduce the risk of compromise.
Reference: https://helpx.adobe.com/security/products/flash-player/apsb17-32.html
Snort SID: 44583-44584