Ramnit PDF malware analysis — malicious · 46bf73194ca8d9c8

MALICIOUS

PDF

111.4 KB

MD5: 615d662c1faabffbeb47ef817b0d0951 SHA-1: 5670ac612d5bfc869dd26b7177d073172b1b7bc3 SHA-256: 46bf73194ca8d9c87c382f772b2dbc8b4ea80ac0b20fdfea6393f130b8b9ecda

180 Risk Score

Malware Insights

Ramnit · confidence 95%

MITRE ATT&CK

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

The PDF contains an embedded VBScript that reconstructs and executes a PE payload named 'svchost.exe'. This script is indicative of a downloader or dropper. ClamAV detection confirms the presence of the Ramnit trojan family. The embedded script's functionality aligns with the Ingress Tool Transfer (T1105) and Malicious File (T1204.002) MITRE ATT&CK techniques.

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_000003dd.vbs` `50b36b292c4a29f5f0d9642bb1487d597e7f817cb538628ff0d791b00e4fac65`	pdf-embedded-script	PDF raw bytes VBScript dropper at offset 0x3DD	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 0x3DD	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.

Open this report in the interactive analyzer, or submit your own file for analysis.