Ramnit PDF malware analysis — malicious · 30ea395e08fead7d

MALICIOUS

PDF

111.7 KB

MD5: b8489432aa08ea705191507aa5e2497c SHA-1: d6d3008eb90ce68bd48beb6073e7489a1592ee5b SHA-256: 30ea395e08fead7d039170472d0afdf5bf62282f0a60298fee02829bc087f154

210 Risk Score

Malware Insights

Ramnit · confidence 95%

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File T1105 Ingress Tool Transfer

The PDF contains embedded VBScript which reconstructs and executes a PE payload named 'svchost.exe'. This payload was detected by ClamAV as Win.Trojan.Ramnit. The embedded VBScript uses 'Scripting.FileSystemObject' to write the PE payload to disk, and 'WScript.Shell' to execute it. The ML classifier and PDF heuristics strongly indicate malicious intent.

Machine Learning

Nyx PDF Classifier malicious score 0.9986

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_000004c7.vbs` `50b36b292c4a29f5f0d9642bb1487d597e7f817cb538628ff0d791b00e4fac65`	pdf-embedded-script	PDF raw bytes VBScript dropper at offset 0x4C7	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 0x4C7	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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