PDF malware analysis — malicious · 5e1b329f3197e1d7

MALICIOUS

PDF

8.8 KB Created: 2009-07-27 10:53:51 Authoring application: YRVmzswHfRDDI (via lNWFCPYVEfqirCY)

MD5: ae40ee3ee4f38cb19a65810d376f7666 SHA-1: 3d1fa3a62da0b70464fc650cbdfc9d58a9129d76 SHA-256: 5e1b329f3197e1d7687037e8a5181c31394839e7d980e2bc8444d4fd6ee9867d

216 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains obfuscated JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, PDF_FROMCHARCODE, and PDF_EVAL. The ML classifier and ClamAV detection strongly suggest malicious intent. The JavaScript code, particularly the use of eval(), is designed to deobfuscate and execute further malicious code, consistent with a dropper functionality.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

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.
ClamAV: Pdf.Dropper.Agent-1828742 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-1828742
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.
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.

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0007_000.js` `775b43c4d32960316af0ad911f92a7a972747c140c4b698052517089e1c0bf98`	pdf-javascript-stream	PDF /JS object 7 at offset 0x498	5831 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).
`javascript_obj0007_001.js` `f4f76d179a7414062e4afcd160284072f509e74ee45cd3db3121ee957efd36fe`	pdf-javascript-stream	PDF /JS object 7 at offset 0x498	2468 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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