PDF malware analysis — malicious · ae8094a4d6308d19

MALICIOUS

PDF

3.2 KB Created: 2009-06-29 01:57:50 Authoring application: fLPMNGwbN1wp (via w8Y1CET8LXD)

MD5: 3728a478f1727a649437150d6de3abdd SHA-1: 3c8b9c023c48be1724879aee84d50b60f9257b51 SHA-256: ae8094a4d6308d1927568637c474d00f0277219cae763ff82bdd11a77501a56f

208 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT and PDF_JS. The ML classifier and ClamAV detection (Js.Exploit.Shellcode-18) strongly suggest malicious intent. The presence of an unescape() call and the ML_NYX_PDF_MALICIOUS score point towards obfuscated JavaScript code designed to exploit a vulnerability and likely download a secondary payload. The extracted artifact javascript_obj0007_000.js is flagged as suspicious.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 6

ClamAV: Js.Exploit.Shellcode-18 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Js.Exploit.Shellcode-18
ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV

ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits (matched inside decoded stream)
JavaScript action low PDF_JAVASCRIPT

PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
Suspicious extracted artifact info 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
`javascript_obj0007_000.js` `568f53ceebed39c4d0abfa0c7231f94c2fe43fc8126c9b221d32ab6513a14ba7`	pdf-javascript-stream	PDF /JS object 7 at offset 0x245	1955 bytes
Detection ClamAV: Js.Exploit.Shellcode-18 Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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