PDF malware analysis — malicious · faea7ea78f77f3d1

MALICIOUS

PDF

289.4 KB

MD5: c8065f2177f8a214680b8212c6e93537 SHA-1: f31354acb8613c8adee5964555894b25dc1a6067 SHA-256: faea7ea78f77f3d1784c3b700fd3e22462f056c3b2bc00f4ae53f845b54d097e

210 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains an embedded script payload and a launch action, indicating an attempt to execute malicious code. The script content, partially reconstructed, suggests the use of cmd.exe and WScript.Shell to potentially download and execute further stages, likely leveraging environment variables like %TEMP%. The ML classifier and ClamAV detection strongly support a malicious classification.

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_000482db.bin` `11589cca617ae73a8e55a3d7369feadce5514d16ed1d47daace1e23442a406ad`	pdf-embedded-script	PDF decompressed stream script payload at offset 0x482DB	296232 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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