PDF malware analysis — malicious · b8e805ebf9f915f5

MALICIOUS

PDF

289.5 KB

MD5: 176b3c15ed69f0afede42efcfb070b30 SHA-1: e78952b64b3ddfa0acee357da937b5dae07b080a SHA-256: b8e805ebf9f915f54b6323f0d881fd24b64e87b4c0956ba42fb147d93fc1b13f

210 Risk Score

Malware Insights

MITRE ATT&CK

T1059.003 Windows Command Shell T1204.002 Malicious File T1566.002 Spearphishing Attachment

The PDF contains embedded scripts and a launch action, indicating it is designed to execute malicious code. The heuristics and ML classifier strongly suggest malicious intent. The embedded script appears to be constructing a command to execute a file, likely a second-stage payload, from the temporary directory.

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_0004831f.bin` `3a12476037baa6dce9dc68a8a1753eaedf382f3ffe1e8d6d844678c9fc9f2d77`	pdf-embedded-script	PDF decompressed stream script payload at offset 0x4831F	296300 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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