PDF malware analysis — malicious · aa9deb9508738b64

MALICIOUS

PDF

289.5 KB

MD5: 29486d92431951e85dfbebcb6cdda365 SHA-1: 5cf87745de2149facc9ccdff4b21384204897a1d SHA-256: aa9deb9508738b64c940c015151fb1969310b25cd15d5e97de8453f7c9d15587

212 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File T1566.002 Spearphishing Attachment

The PDF file contains an embedded script payload and a launch action, indicating it is designed to execute malicious code upon opening. The script appears to use cmd.exe and WScript.Shell to potentially download and execute further stages, as suggested by the presence of 'Scripting.FileSystemObject' and 'ExpandEnvironmentStrings'. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

Nyx PDF Classifier malicious score 0.9998

Heuristics 4

Launch action critical PDF_LAUNCH

PDF contains a /Launch action whose target is an executable, URL, or UNC path — can start an external application
ClamAV: Heuristics.PDF.ObfuscatedNameObject critical CLAMAV_DETECTION

ClamAV detected this file as malware: Heuristics.PDF.ObfuscatedNameObject
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 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`embedded_pdf_script_00048302.bin` `0c8a6997b42481d7a9ece8022af24362ee3f576bfe0fdf32a6d361d3bfba981e`	pdf-embedded-script	PDF decompressed stream script payload at offset 0x48302	296271 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 shell/COM execution token(s). Carved artifact contains 1 long hex-escaped blob(s).

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