PDF malware analysis — malicious · 8c793875755a5f10

MALICIOUS

PDF

3.5 KB Created: 2009-05-05 20:38:31 Authoring application: Scribus 1.3.3.12 (via Scribus PDF Library 1.3.3.12)

MD5: 97ee138c7dfcef3ded79cad5d8ab7a19 SHA-1: 53cd4251f4f2eb40fe64bae2d5dc5dd465b97c1a SHA-256: 8c793875755a5f1049f4ed771665904942af93edd5e539746d98601d90ac3685

216 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF contains embedded JavaScript, including calls to eval() and String.fromCharCode(), indicating an attempt to obfuscate malicious code. ML classifiers and ClamAV detections strongly suggest this is a malicious exploit targeting PDF vulnerabilities. The primary intent appears to be the execution of a second-stage payload via the embedded and deobfuscated JavaScript, as indicated by the 'Pdf.Exploit.Agent-35568' detection.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 7

ClamAV: Pdf.Exploit.Agent-35568 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-35568
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` `d3ad2314fefa4afaff553e8ca58e4be9029287083f29827f96438354f772756d`	pdf-javascript-stream	PDF /JS object 13 at offset 0x3CE	7150 bytes
Detection ClamAV: Pdf.Exploit.Agent-35568 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` `303c2447570941f14f7145f9e88a2fc2e449499fe9ecb1611d739fa624e25795`	deobfuscated-js	PDF JavaScript deobfuscation pass	16248 bytes
Detection ClamAV: Pdf.Exploit.Agent-35568 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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