PDF malware analysis — malicious · 308f97fe4184a3da

MALICIOUS

PDF

343.9 KB

MD5: add6b59c4b74733ac6a16f3f34e17430 SHA-1: 54803c24f872d79371c79d4a53ae1cb8bb674546 SHA-256: 308f97fe4184a3dae296edf807edcca8dfe10a4bb141581e75635e76d9cea193

168 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1559.001 Component Object Model Hijacking

The PDF file was flagged as malicious by a machine learning classifier and ClamAV, specifically as Pdf.Exploit.Agent-36189. Static analysis revealed embedded JavaScript, including an unescape() call and the use of ASCIIHexDecode filters, indicating obfuscation and exploit activity. The primary attack vector appears to be the execution of malicious JavaScript embedded within the PDF.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

Heuristics 6

ClamAV: Pdf.Exploit.Agent-36189 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-36189
unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits (matched inside decoded stream)
ASCIIHexDecode filter (with exploit indicators) medium PDF_FILTER_HEX

Hex-encoding filter present alongside exploit delivery indicators — often used to hide payload or shellcode bytes
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_obj0008_000.js` `5a71ec20d39bb845cdad3def6c6143e40b7c07681c39a86d4fd51194d43fb2ca`	pdf-javascript-stream	PDF /JS object 8 at offset 0x1E7	117127 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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