PDF malware analysis — malicious · 39f3d8a83e28382e

MALICIOUS

PDF

6.7 KB Created: 2009-11-17 23:22:12 Authoring application: Scribus 1.3.5svn (via Scribus PDF Library 1.3.5svn)

MD5: f57aff5653ac14c66c5649aacf7889b8 SHA-1: 70bba53a645cc64f95bde9b5b313febd550036af SHA-256: 39f3d8a83e28382ec912658ffd5d68f151f67a77a2901b4dab4a8f455edd7681

156 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript T1566.002 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically identified as 'Pdf.Exploit.Agent-20556'. It contains embedded JavaScript, indicated by heuristics like PDF_JAVASCRIPT and PDF_JS, and utilizes functions such as unescape() and String.fromCharCode, suggesting obfuscation to hide malicious actions. The primary attack pattern involves exploiting PDF vulnerabilities to execute code, likely leading to the download and execution of a secondary payload.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 6

ClamAV: Pdf.Exploit.Agent-20556 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-20556
unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits (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 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0016_001.js` `919c4ce0112b309144168d538b1cc727ad676c37a047144d289c4982c2fb9f23`	pdf-javascript-stream	PDF /JS object 16 at offset 0xC9A	12549 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).

Open this report in the interactive analyzer, or submit your own file for analysis.