PDF malware analysis — malicious · fb35071c39a90bd1

MALICIOUS

PDF

17.4 KB Created: 2009-08-01 12:00:39 Authoring application: JMTJBYclPbJ5UN (via XwllfxnuV)

MD5: ab98352ac5422541ff963299f8758bb2 SHA-1: 2b0b9a73605a1262fbda2edaccdf5ba067cd2b9a SHA-256: fb35071c39a90bd1c2e32f5a39d3be3bdeaadd4255bee179fb6b76007130e04a

156 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

This PDF file was flagged as malicious by a ClamAV signature (Js.Trojan.Obfus-48) and a machine learning classifier. Static analysis revealed embedded JavaScript with obfuscated code, including the use of eval() and String.fromCharCode, indicating an attempt to hide malicious functionality. The JavaScript likely downloads and executes a second-stage payload.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 6

ClamAV: Js.Trojan.Obfus-48 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Js.Trojan.Obfus-48
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.
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` `ee46cb6fe918944d128af635884f1326878b9d1055630db5dfac62ced54555a2`	pdf-javascript-stream	PDF /JS object 7 at offset 0x240	16486 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 7 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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