PDF malware analysis — malicious · 03520ae9c125ad1b

MALICIOUS

PDF

1.24 MB Created: 2010-07-29 09:35:00 Authoring application: Scribus 1.3.3.14 (via Scribus PDF Library 1.3.3.14)

MD5: 49d1801037898b04f8a742898813a403 SHA-1: a4ca6a876101efbe01a2ecdcbe87d7bfcea9f842 SHA-256: 03520ae9c125ad1be538e2cfae840b6c4ec2f31025e994195355e67a762b2aa2

118 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains embedded JavaScript streams that are heavily obfuscated. These scripts appear to be designed to exploit a vulnerability within the PDF reader, likely to download and execute a second-stage payload. The ML classifier strongly indicates maliciousness, and the presence of exploit-related heuristics further supports this. No specific family could be identified due to the obfuscation.

Machine Learning

Nyx PDF Classifier malicious score 0.9876

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.
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.
Embedded URL info EMBEDDED_URL

One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
URL http://www.monotype.comMonotype
- http://ocsp.verisign.com/ocsp/status0
- https://www.verisign.com/rpa0
- http://www.monotype.com/html/mtname/ms_timesnewroman.htmlhttp://www.monotype.com/html/mtname/ms_welcome.htmlhttp://www.monotype.com/html/type/license.html
- https://www.verisign.com/rpa
- http://crl.microsoft.com/pki/crl/products/CodeSignPCA.crl0
- http://www.microsoft.com/typography
- http://www.iec.ch

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0055_001.js` `dead0352934e26632367dc0966f8aa21cd3ec5eca925cdb3f9954718ad63cdfd`	pdf-javascript-stream	PDF /JS object 55 at offset 0x13DBAE	1682 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 6 eval/decoder/string-building token(s).
`javascript_obj0055_002.js` `62e0261af461116f5f484bcbe3a720e46f6dd23854d59b7a50a4aa4f786b98ff`	pdf-javascript-stream	PDF /JS object 55 at offset 0x13DBD1	3175 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 6 eval/decoder/string-building token(s).

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