FlashPack is an exploit kit that attempts to exploit vulnerabilities in a user's computer or mobile device (or in the programs installed on it). If successful, FlashPack will then download additional malware onto the compromised device.
Based on the settings of your F-Secure security product, it will either automatically delete, quarantine or rename the detected program or file, or ask you for a desired action.
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As with most exploit kits, users may encounter FlashPack on a compromised site on which an attacker has silently inserted the kit (much like a driveby download attack), or on malicious sites user has been forcibly redirected to from a compromised site.
FlashPack attempts to run various exploits against the user's computer in order to probe for any vulnerabilities present in programs installed on the machine, or in the computer's operating system itself; if the exploit(s) are successful, then the user's machine may be compromised and exposed for further intrusion.
For more about exploit kits, see Article: Exploit kits.