There is no tcpdump 4.0.7, newest is 4.0.0. And why tcpdump.exe file in pack was changed 2009.07.22 11:10?
Gotemans how and where did you scaned this file? You are suspicious because

show that there is Ardamax keylogger.
Antivirus Version Last Update Result
a-squared 4.5.0.24 2009.07.22 Trojan-Spy.Win32.Ardamax!IK
AhnLab-V3 5.0.0.2 2009.07.22 Win-Trojan/Ardamax.14848.D
AntiVir 7.9.0.222 2009.07.22 ADSPY/Dropper.Ardamax.Gen
Antiy-AVL 2.0.3.7 2009.07.22 Trojan/Win32.Ardamax.gen
Authentium 5.1.2.4 2009.07.22 W32/Trojan.CCFT
Avast 4.8.1335.0 2009.07.21 Win32:Ardamax-LV
AVG 8.5.0.387 2009.07.22 PSW.Generic6.AVJG
BitDefender 7.2 2009.07.22 Trojan.Spy.Ardamax.N
CAT-QuickHeal 10.00 2009.07.22 TrojanSpy.Ardamax.n
ClamAV 0.94.1 2009.07.22 Trojan.Dropper-2328
Comodo 1729 2009.07.21 TrojWare.Win32.TrojanSpy.Ardamax.~BA
DrWeb 5.0.0.12182 2009.07.22 -
eSafe 7.0.17.0 2009.07.21 -
eTrust-Vet 31.6.6632 2009.07.22 -
F-Prot 4.4.4.56 2009.07.21 W32/Trojan.CCFT
F-Secure 8.0.14470.0 2009.07.22 Trojan-Spy.Win32.Ardamax.n
Fortinet 3.120.0.0 2009.07.22 Spy/Ardamax
GData 19 2009.07.22 Trojan.Spy.Ardamax.N
Ikarus T3.1.1.64.0 2009.07.22 Trojan-Spy.Win32.Ardamax
Jiangmin 11.0.800 2009.07.22 TrojanSpy.Ardamax.vm
K7AntiVirus 7.10.798 2009.07.21 Trojan-Spy.Win32.Ardamax
Kaspersky 7.0.0.125 2009.07.22 Trojan-Spy.Win32.Ardamax.n
McAfee 5683 2009.07.21 Spy-Agent.cv
McAfee+Artemis 5683 2009.07.21 Spy-Agent.cv
McAfee-GW-Edition 6.8.5 2009.07.22 Ad-Spyware.Dropper.Ardamax.Gen
Microsoft 1.4903 2009.07.22 MonitoringTool:Win32/Ardamax
NOD32 4266 2009.07.22 Win32/KeyLogger.Ardamax
Norman 6.01.09 2009.07.21 Ardamax.gen2
nProtect 2009.1.8.0 2009.07.22 -
Panda 10.0.0.14 2009.07.21 Application/Ardamax
PCTools 4.4.2.0 2009.07.21 TrojanSpy.Ardamax.W
Prevx 3.0 2009.07.22 -
Rising 21.39.22.00 2009.07.22 Trojan.Spy.Win32.Ardamax.n
Sophos 4.43.0 2009.07.22 Ardamax Installer
Sunbelt 3.2.1858.2 2009.07.21 -
Symantec 1.4.4.12 2009.07.22 Suspicious.MH690.A
TheHacker 6.3.4.3.372 2009.07.21 Trojan/Spy.Ardamax.n
TrendMicro 8.950.0.1094 2009.07.22 TSPY_ARDAMAX.GA
VBA32 3.12.10.8 2009.07.22 Trojan-Spy.Win32.Ardamax.n
ViRobot 2009.7.22.1847 2009.07.22 -
VirusBuster 4.6.5.0 2009.07.21 TrojanSpy.Ardamax.W