PDF malware analysis — malicious · c085b9a3f53ff3d0

MALICIOUS

PDF

3.5 KB Created: 2009-04-12 19:38:41 Authoring application: Scribus 1.3.3.12 (via Scribus PDF Library 1.3.3.12)

MD5: c95f2bbb6f79fb7d0ad8319077fba3b7 SHA-1: dc96ae2cd4d5b93132f8e6b61c68fd2458beb215 SHA-256: c085b9a3f53ff3d05817083a631313c7f7361d40d7a400174236e3d0207f8d67

216 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

This PDF file was flagged by multiple high-severity heuristics, including a critical ClamAV detection for 'Pdf.Exploit.Agent-35835'. The presence of JavaScript actions, embedded JS streams, and particularly the use of eval() and String.fromCharCode() strongly indicate the execution of malicious code. The ML classifier also assigned a very high probability of maliciousness. The primary attack vector appears to be exploiting a PDF vulnerability to achieve arbitrary code execution.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 7

ClamAV: Pdf.Exploit.Agent-35835 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-35835
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.
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (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.
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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0013_000.js` `ff94a7a62299ff805450ea88dfdbff739197a3e56472202c40679800dc1c4c6a`	pdf-javascript-stream	PDF /JS object 13 at offset 0x3CE	7147 bytes
Detection ClamAV: Pdf.Exploit.Agent-35835 Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`deobfuscated.js` `bc858caba5c46fa74f42ee2772355a6e619456d7a997771cfbe53e09bb8440ff`	deobfuscated-js	PDF JavaScript deobfuscation pass	16030 bytes
Detection ClamAV: Pdf.Exploit.Agent-35835 Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s). Carved artifact contains 2 long base64-like blob(s).

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