Ramnit PDF malware analysis — malicious · ede52cd70b493fce

MALICIOUS

PDF

111.7 KB

MD5: 0b48653c89cdcdafe8d4b0aeef8dc57d SHA-1: c36b9a4ad17697896c13af0921b431db161f29b4 SHA-256: ede52cd70b493fce29b25616d3ba3789505af83d12e6642cf392c5e7ca83056d

212 Risk Score

Malware Insights

Ramnit · confidence 95%

MITRE ATT&CK

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

The PDF document contains an embedded VBScript payload that is designed to reconstruct and execute a PE file. The script utilizes 'Scripting.FileSystemObject' and 'WScript.Shell' to write and run the embedded PE payload, identified as svchost.exe. ClamAV detection and ML classification strongly indicate malicious intent, with the extracted artifact matching the Ramnit family. The embedded VBScript is responsible for dropping and executing the second-stage payload.

Machine Learning

Nyx PDF Classifier malicious score 0.9695

Heuristics 5

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.
PDF paints image(s) but contains no text operators info PDF_IMAGE_ONLY_LURE

PDF has 1 image XObject(s) and the content stream contains no text-emitting operators (BT/ET, Tj, TJ, ', ") in either raw bytes or decompressed streams — this is the screenshot-as-PDF pattern used to bypass text-based scanners and to deliver instructions purely through rendered pixels. It is informational unless paired with invisible links or risky URI context.

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`embedded_vbs_dropper_000004da.vbs` `50b36b292c4a29f5f0d9642bb1487d597e7f817cb538628ff0d791b00e4fac65`	pdf-embedded-script	PDF raw bytes VBScript dropper at offset 0x4DA	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 0x4DA	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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