PDF malware analysis — malicious · 1bef19290afd60c2

MALICIOUS

PDF

289.4 KB

MD5: b6d95dd9c6830f1388557a7d42e642ad SHA-1: fed511b0a95b361cb07573fa38d9f401f4c9f63c SHA-256: 1bef19290afd60c2b1bec47e12f56de82499131febef870dfe4ee2f0334d1c7e

210 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

This PDF file contains an embedded script that is triggered by a launch action, indicating an attempt to exploit a vulnerability. The script appears to be designed to download and execute a second-stage payload, as suggested by the heuristic firings related to script execution and suspicious artifacts. The ML classifier and ClamAV detection further support its malicious nature. The script itself is obfuscated, making a precise determination of its full functionality difficult, but its primary intent seems to be payload delivery.

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_000482d9.bin` `94e5351a9b9f750334ba5f5c117a93ab6556c3e93a07bbe61de932a4b816a505`	pdf-embedded-script	PDF decompressed stream script payload at offset 0x482D9	296272 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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