PDF malware analysis — malicious · e755495e4de61275

MALICIOUS

PDF

3.5 KB Created: 2009-04-21 21:21:50 Authoring application: Scribus 1.3.3.12 (via Scribus PDF Library 1.3.3.12)

MD5: d27b67306cc82c8833da5f987c235d2f SHA-1: e669ef18bbc93500d9c3a90003773c141fea57ad SHA-256: e755495e4de61275c47eb269f62f6a5dd3a94e7f2337bb224a8b4a6db8851bd8

216 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript, including calls to eval() and String.fromCharCode(), indicating obfuscated malicious code. The ML classifier and ClamAV detection strongly suggest this is an exploit attempting to gain initial access. The extracted artifact 'deobfuscated.js' likely contains the payload or exploit code.

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` `7abf480f551a42d14b4d09cd35c0032dd2c93555f48ed3be3cb9785cebdd2959`	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` `10c595b0010aa9e2131761b2457e7fb63cc2351848c02ed450f369ae777c5e67`	deobfuscated-js	PDF JavaScript deobfuscation pass	16563 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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