Ramnit PDF malware analysis — malicious · 0f0cccb4c4aa1128

MALICIOUS

PDF

111.1 KB

MD5: 1c97c5ee5e80c751f0b48fee2519b145 SHA-1: 50520f8cde05185cd444082ee255ec53f4ae957a SHA-256: 0f0cccb4c4aa11285e47034b3456264286ac6b2676327e5023c53a640b0bb690

210 Risk Score

Malware Insights

Ramnit · confidence 95%

MITRE ATT&CK

T1204.002 Malicious File T1566.001 Spearphishing Attachment T1105 Ingress Tool Transfer

The PDF contains embedded VBScript which reconstructs and executes a Portable Executable (PE) file named 'svchost.exe'. This behavior is indicative of a downloader or dropper, consistent with the Ramnit family, as suggested by the ClamAV signature. The embedded script is responsible for the initial execution of the malicious payload.

Machine Learning

Nyx PDF Classifier malicious score 0.9989

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_000002a5.vbs` `50b36b292c4a29f5f0d9642bb1487d597e7f817cb538628ff0d791b00e4fac65`	pdf-embedded-script	PDF raw bytes VBScript dropper at offset 0x2A5	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 0x2A5	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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