PDF malware analysis — malicious · 2299cadbb0bd9959

MALICIOUS

PDF

10.0 KB Created: 2009-03-27 09:47:55 Authoring application: AUvejyBsaczAQNzR (via jCGRYVwiZRJKcBbZg)

MD5: 16fecf8d030f847228c5fed9527d220b SHA-1: 1b5db7b8ba1f27ad326c1b808b87ec61f9c8a622 SHA-256: 2299cadbb0bd99599a0cd703b14804c6506dbd5f98d870b176d9b96401f4d5d3

116 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The file is a PDF document flagged by ClamAV as Pdf.Exploit.Agent-35572 and a machine learning classifier with high confidence. It contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT and PDF_JS. The JavaScript is obfuscated, but the presence of String.fromCharCode suggests it's designed to construct malicious code or URLs. The primary function appears to be exploiting a PDF vulnerability to execute this script, likely leading to the download and execution of a second-stage payload.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 5

ClamAV: Pdf.Exploit.Agent-35572 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-35572
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.
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` `75df475cea35fe87723069891d055d9b9ced7713e16d8f4501372dc13ff4a408`	pdf-javascript-stream	PDF /JS object 7 at offset 0x57F	7995 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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