PDF malware analysis — malicious · 0225a6eca0c02dde

MALICIOUS

PDF

9.2 KB

MD5: 087b89ab5a31968fbe7e52f7302c7598 SHA-1: b8013f3bf1a274cb6a4f29deb2685090a5b49b4c SHA-256: 0225a6eca0c02dde2df7cfc2e89f8d06a57285cfdf6d1440e781e024653ee353

158 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 that utilizes eval() and String.fromCharCode(), indicating an attempt to obfuscate malicious code. This JavaScript is likely designed to exploit a client-side vulnerability for code execution, with the ultimate goal of downloading and running a secondary payload. No specific family could be identified, and no network IOCs were directly extracted from the file.

Machine Learning

Nyx PDF Classifier malicious score 0.6189

Heuristics 7

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.
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
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. (matched inside decoded stream)
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. (matched inside decoded stream)
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.
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.w3.org/1999/02/22-rdf-syntax-ns#
- http://ns.adobe.com/xap/1.0/
- http://purl.org/dc/elements/1.1/
- http://ns.adobe.com/xap/1.0/mm/
- http://ns.adobe.com/pdf/1.3/

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`stream_002_off00000329.bin` `618b5430cf3c14a301ec45bb1ccc28ec0f5d79ebb42a296cf093098bf3cfd61f`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x329	5067 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`objstm_0024_00.bin` `e0c3629f85cdf26d0b62678edf45612d6234ee8550c932cbe0e3ba72dd0f6c78`	pdf-objstm-decoded	PDF /ObjStm 24 0 obj (inflated)	385 bytes

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