Ramnit PDF malware analysis — malicious · e37ef42b3a259d4f

MALICIOUS

PDF

111.3 KB

MD5: f1d23428eeec87de12e46ed0d0b9cc31 SHA-1: 85c146774e0cbc82599141716adbeb68f7d7765a SHA-256: e37ef42b3a259d4fe297d0c265b5c5f77685a25812adb95d6fde916c50aa8116

210 Risk Score

Malware Insights

Ramnit · confidence 95%

MITRE ATT&CK

T1059.005 Service Execution T1059.003 Windows Command Shell T1204.002 Malicious File T1105 Ingress Tool Transfer

The PDF contains an embedded VBScript dropper that reconstructs and executes a PE payload named 'svchost.exe'. This is strongly indicative of the Ramnit family, which is known for such delivery mechanisms. The VBScript uses 'Scripting.FileSystemObject' and 'WScript.Shell' to write and execute the payload, aligning with T1059.003 and T1059.005. The extracted 'svchost.exe' is confirmed malicious by ClamAV.

Machine Learning

Nyx PDF Classifier malicious score 0.9997

Heuristics 4

VBScript in PDF stream reconstructs and runs a PE payload critical PDF_VBS_HEX_PE_DROPPER

PDF stream contains an HTML/VBScript block that decodes a long hex string into a Windows executable and runs it via WScript.Shell. This is an embedded dropper payload, not ordinary PDF JavaScript.
ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV

ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
Embedded script payload in PDF stream high PDF_EMBEDDED_SCRIPT_PAYLOAD

PDF stream bytes contain script execution markers such as ActiveXObject/CreateObject, WScript.Shell, PowerShell, or shell-exec primitives. This is stronger than ordinary PDF JavaScript because it indicates a staged external script payload hidden in stream bytes.
Suspicious extracted artifact medium EXTRACTED_FILE_STATIC_TRIAGE

One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`embedded_vbs_dropper_00000360.vbs` `50b36b292c4a29f5f0d9642bb1487d597e7f817cb538628ff0d791b00e4fac65`	pdf-embedded-script	PDF raw bytes VBScript dropper at offset 0x360	113122 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 shell/COM execution token(s). Carved artifact contains 1 long base64-like blob(s).
`svchost.exe` `fd6c69c345f1e32924f0a5bb7393e191b393a78d58e2c6413b03ced7482f2320`	embedded-pe	Decoded PE from PDF VBScript dropper at offset 0x360	56320 bytes
Detection ClamAV: Win.Trojan.Ramnit-9775455-0 Obfuscation or payload: likely Carved artifact entropy is 7.89, consistent with packed or encrypted content.

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