PDF malware analysis — malicious · 673d8179002169ec

MALICIOUS

PDF

1.25 MB Created: 2010-07-29 12:56:45 Authoring application: Scribus 1.3.3.14 (via Scribus PDF Library 1.3.3.14)

MD5: dd4ddfa2300c342a46d7857223a0e080 SHA-1: e1320352a4a9b8d4c7316dbedd4f32b0adc0f8c8 SHA-256: 673d8179002169ec524b9b538a8153383921c41ed16dbb14de3a5e3eb3b8c026

118 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF file exhibits multiple heuristic firings related to JavaScript execution and exploitation, including 'PDF_JAVASCRIPT', 'PDF_JS', and 'PDF_JS_EXPLOIT_CLUSTER'. Two JavaScript streams were extracted, indicating the presence of malicious code. The ML classifier also strongly flagged this PDF as malicious. The embedded JavaScript is likely responsible for executing the malicious payload, potentially leading to further compromise.

Machine Learning

Nyx PDF Classifier malicious score 0.9850

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` `8e17bb104ab64df310f13afdc0613c17fedaa2dad42ba1c9969d3e42731457e6`	pdf-javascript-stream	PDF /JS object 55 at offset 0x13DBAE	11213 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).
`javascript_obj0055_002.js` `0d50d9799ff1f70b511f17b7ab3a504f2bef26439a9c2bbbe0bb429d15c9a2c3`	pdf-javascript-stream	PDF /JS object 55 at offset 0x13DBD2	12706 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).

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