PDF malware analysis — malicious · 18b18b708c5e1429

MALICIOUS

PDF

289.4 KB

MD5: 1fbe084da4dc293a1c3e4036d66d1a77 SHA-1: acb9d689f1a462ed4031ed243990494b786a6e95 SHA-256: 18b18b708c5e1429653da765b08c37bc18b8ff67392a609a6dfdf0c725363af2

210 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file contains an embedded script payload, flagged by multiple heuristics as malicious. The script is likely designed to download and execute a secondary payload, as indicated by the 'PDF_LAUNCH' and 'PDF_EMBEDDED_SCRIPT_PAYLOAD' firings. The ML classifier also strongly indicates maliciousness. The exact behavior of the script is difficult to ascertain due to obfuscation, but its presence and the PDF's structure point to a malicious document 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` `126164e28ef56e05f22175df9290dcdc7b0cf12ab567b1893c7efcace87b1ce9`	pdf-embedded-script	PDF decompressed stream script payload at offset 0x482D9	296230 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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