PDF malware analysis — malicious · 79d2f566e2bf2bf3

MALICIOUS

PDF

289.4 KB

MD5: f7c4cf2c0d989b3f9a97d32d96572800 SHA-1: db90cb3ad30763a062b250e91237667373c84902 SHA-256: 79d2f566e2bf2bf34045b6ba0006dd0073279d8f69291bf8ba30f7af3964ca63

210 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains an embedded script payload, indicated by the PDF_EMBEDDED_SCRIPT_PAYLOAD heuristic. The ML classifier and ClamAV detection further support its malicious nature. The script, partially visible in the DOC BODY, appears to be a PowerShell command that uses Scripting.FileSystemObject and WScript.Shell to likely download and execute a second-stage payload from a remote location, targeting the user's temporary directory. The PDF_LAUNCH heuristic also confirms an attempt to launch an action.

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_000482fb.bin` `e065f480ff93903c87605a5db8b9284a79ed50e89e5178b71d034070a2016af1`	pdf-embedded-script	PDF decompressed stream script payload at offset 0x482FB	296264 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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