PDF malware analysis — malicious · 5b3b44b69ee662ab

MALICIOUS

PDF

289.4 KB

MD5: bd7819ae2a3798e927055bbe6361696a SHA-1: 7de936640c226502f20f5845e34ee2080178e8dc SHA-256: 5b3b44b69ee662abb26a3f439fc6f2eca0fbf93ecec74ebf341e362d47b48d53

210 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF file contains an embedded script payload, indicated by multiple high-severity heuristics. The script is designed to execute a command using cmd.exe, which likely downloads and executes a second-stage payload. The presence of obfuscation and script execution terms further supports 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_000482d7.bin` `e18d162811be49cfc70885efe70e844640865b1a124080509b6a0e95c93b8285`	pdf-embedded-script	PDF decompressed stream script payload at offset 0x482D7	296228 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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