PDF malware analysis — malicious · 116627fba6a39506

MALICIOUS

PDF

1.25 MB Created: 2010-07-29 12:49:45 Authoring application: Scribus 1.3.3.14 (via Scribus PDF Library 1.3.3.14)

MD5: 52dec87f64e60c076c1ce9aaec4cffb1 SHA-1: 7f298d941d469dbe983711c78f35fe5cee3ef606 SHA-256: 116627fba6a39506d248de35f469f09b4670a9798ec01dd1ab6b27882d6973c2

118 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF file contains multiple embedded JavaScript streams, flagged as a PDF JavaScript exploit cluster. The JavaScript code itself appears to be heavily obfuscated, with repeated function definitions and truncated content, suggesting an attempt to hide malicious functionality. The primary purpose of this script is likely to download and execute a second-stage payload, which is a common technique for initial 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` `8878fdbcc0b3da8fa0170a76865f81f1cfbf8c15218fc3c4cb5e94299edeebcf`	pdf-javascript-stream	PDF /JS object 55 at offset 0x13DBAE	11012 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`javascript_obj0055_002.js` `98a13076c22e142e03cd30a24e18f575e9fdca15324552da08ea3f147144d09c`	pdf-javascript-stream	PDF /JS object 55 at offset 0x13DBD2	12505 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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