PDF malware analysis — malicious · 7f629bb1957540df

MALICIOUS

PDF

12.7 KB Created: 2008-31-20 53:85:00 Authoring application: Scribus 1.3.3.12 (via Scribus PDF Library 1.3.3.12)

MD5: 0eb6659bfac7524e4d20029817878680 SHA-1: e937473333ca6987626f41cd9fd6b52d8cd1249c SHA-256: 7f629bb1957540df03070c6eeb3c01ca04dd6f1a4206a654bb540823f9a873c5

216 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript that utilizes unescape() and String.fromCharCode() functions, indicating obfuscation and potential exploit code. The critical PDF JavaScript exploit cluster heuristic and ClamAV detection of 'Pdf.Dropper.Agent-7276852-0' strongly suggest it's a dropper. The embedded JavaScript is designed to download and execute a second-stage payload, a common technique for initial compromise via spearphishing attachments.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 7

PDF JavaScript exploit cluster critical PDF_JS_EXPLOIT_CLUSTER

PDF combines an executable JavaScript/action surface with exploit staging indicators such as eval/unescape/fromCharCode, XFA script content, or a related CVE pattern. Benign form JavaScript remains low-severity, but this correlated cluster is high-confidence malicious behavior.
ClamAV: Pdf.Dropper.Agent-7276852-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-7276852-0
unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits
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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0013_001.js` `210df8b4585afb45eeb380cbb8b6003193f6fce8194ca55e7f16c7ea05d10f16`	pdf-javascript-stream	PDF /JS object 13 at offset 0x38C	11458 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`javascript_obj0013_002.js` `992b75efedf3da079b3b9d46d5a5dad75aff0113f78ee9fd274e626e65279ff7`	pdf-javascript-stream	PDF /JS object 13 at offset 0x3AF	12049 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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