PDF malware analysis — malicious · 0dbfb1ff62224248

MALICIOUS

PDF

10.9 KB Created: 2009-01-35 62:12:26 Authoring application: Adobe

MD5: 4f159976e436f7f7ef61093e44e3ad61 SHA-1: 4c84e79aae47ec163939d506546d11ba5977068a SHA-256: 0dbfb1ff62224248871278eb13ff6aa8aec937f053340b4396732a64bb7cb655

116 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF sample contains multiple embedded JavaScript streams that are heavily obfuscated. The JavaScript appears to be designed to download and execute a second-stage payload from a constructed URL. The critical heuristic firing 'PDF_JS_EXPLOIT_CLUSTER' strongly indicates exploitation of a known PDF vulnerability to achieve code execution.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

Heuristics 5

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. (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.

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0012_000.js` `03dd95f364c28fcb095914e1bb43d64f5a62c05cbf8aea51ba3a81f9b5dc32c2`	pdf-javascript-stream	PDF /JS object 12 at offset 0x2408	953 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`javascript_obj0013_001.js` `43a71e82f4161ff513d3f7525e27dbad82c903ea63aa8f190c8f0c3fca1b7f51`	pdf-javascript-stream	PDF /JS object 13 at offset 0x25C2	1293 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`javascript_obj0014_002.js` `7ac20ea290ead79138de78c4d0a684a52c7367d8b82d0c2ac62e9535755f314a`	pdf-javascript-stream	PDF /JS object 14 at offset 0x27A6	901 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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