PDF malware analysis — malicious · 055cff19177cfbbd

MALICIOUS

PDF

1.25 MB Created: 2010-07-29 12:16:08 Authoring application: Scribus 1.3.3.14 (via Scribus PDF Library 1.3.3.14)

MD5: 35249ff54cc6fedcd083f020bae5453b SHA-1: 0527b5858e9b6441c3dfc1e5db3e7ac1b8c3c4c0 SHA-256: 055cff19177cfbbd2091d422f0112b8f65c6b8c9f5b0699ffa2407471998325c

118 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF file contains embedded JavaScript streams, identified by heuristics as a PDF JavaScript exploit cluster. The JavaScript code itself appears to be heavily obfuscated or truncated, but its presence and the exploit cluster firing strongly suggest it is designed to download and execute a secondary payload. The benign URLs present do not indicate the final destination of any malicious payload.

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` `9ef9e0357317a03d2d795a38bf3e7fda7c3410b85859f81534f6f93f3d46aead`	pdf-javascript-stream	PDF /JS object 55 at offset 0x13DBAE	10861 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`javascript_obj0055_002.js` `f7590ca59c4cde45070d8bd89340d21864fcbcd9eb84644dce90178da8a02420`	pdf-javascript-stream	PDF /JS object 55 at offset 0x13DBD2	12354 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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