PDF malware analysis — malicious · 8317df07c345d94e

MALICIOUS

PDF

85.5 KB

MD5: c9a473719da98cc1e7761d6a5748c059 SHA-1: a602752823934aedbca41c99bb84e74bae044842 SHA-256: 8317df07c345d94ee92c1bef2254fa19862b1e1eb647cd5df5b251efbee9b20f

116 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as 'Pdf.Exploit.Agent-20352'. Heuristics indicate the presence of embedded JavaScript, including the use of String.fromCharCode, which is often used for obfuscation. The ML classifier's high score and the ClamAV detection strongly suggest this PDF exploits a vulnerability to execute code. The extracted JavaScript file, 'javascript_obj0009_000.js', likely contains the malicious logic, potentially downloading and executing a second-stage payload.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 5

ClamAV: Pdf.Exploit.Agent-20352 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-20352
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.
String.fromCharCode low PDF_FROMCHARCODE

String.fromCharCode found — used to construct payload strings dynamically. Common in benign JavaScript libraries for codepoint manipulation, so this alone is informational; weaponised use is also caught by the dedicated fromCharCode-stage and exploit-shape rules. (matched inside decoded stream)
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_obj0009_000.js` `7bb06ef456ce547fc0f91a930175b56679b91c6aa3b69bc1f96e6326d68fb84f`	pdf-javascript-stream	PDF /JS object 9 at offset 0x11515	22979 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 12 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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