PDF malware analysis — malicious · 0fe93e97f388c77a

MALICIOUS

PDF

5.1 KB Created: 2009-02-13 04:13:07 Authoring application: Scribus 1.3.3.12 (via Scribus PDF Library 1.3.3.12)

MD5: 289d8bba31bb2e4455f3d28b74926c1d SHA-1: bfd745d016fbb0dddf9fbd4054935f6660b51821 SHA-256: 0fe93e97f388c77ad853b7b646e38b082326515273c5b196d59abc5d5532b3c3

176 Risk Score

Malware Insights

MITRE ATT&CK

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

The sample is a PDF containing obfuscated JavaScript. This script is designed to download and execute a second-stage payload, as indicated by the PDF_JS_EXPLOIT_CLUSTER and ML_NYX_PDF_MALICIOUS heuristics. The ClamAV detection name 'Pdf.Dropper.Agent-7229576-0' further supports its role as a dropper. The embedded JavaScript uses a custom RC4-like stream cipher for obfuscation, making direct analysis of the payload URL challenging without further deobfuscation.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 6

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-7229576-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-7229576-0
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_obj0013_000.js` `750a64dfa28b4d0a7d6a64209b5019d47a925df2ba078740d50abadfb445d140`	pdf-javascript-stream	PDF /JS object 13 at offset 0x3CE	5496 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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