Ramnit PDF malware analysis — malicious · 7b628d37a5b21253

MALICIOUS

PDF

110.9 KB

MD5: cbc795c4ead2c605fafbaef2d1a35854 SHA-1: 23b7eae7d6610e759c6b0b9c6d9b26e67b076d78 SHA-256: 7b628d37a5b21253a8edd4096a745ddebbcd0f9f736f2b61afc74c635b465a9c

210 Risk Score

Malware Insights

Ramnit · confidence 95%

MITRE ATT&CK

T1059.005 Service Execution T1204.002 Malicious File T1105 Ingress Tool Transfer

This PDF file contains an embedded VBScript that reconstructs and executes a PE payload, identified as svchost.exe. The VBScript is designed to drop and run the PE file, which has been detected by ClamAV as Win.Trojan.Ramnit. The ML classifier also strongly indicates maliciousness. The embedded script's primary function is to download and execute a second-stage payload, aligning with the Ramnit family's known behavior.

Machine Learning

Nyx PDF Classifier malicious score 0.9985

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_000001c5.vbs` `50b36b292c4a29f5f0d9642bb1487d597e7f817cb538628ff0d791b00e4fac65`	pdf-embedded-script	PDF raw bytes VBScript dropper at offset 0x1C5	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 0x1C5	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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