PDF malware analysis — malicious · 73b72096d7551ee3

MALICIOUS

PDF

1.6 KB

MD5: c8ddc56f7bad0140963c1352e230c0b4 SHA-1: 51cfc3e259276d33c9ab827c0545619f6cc58d3b SHA-256: 73b72096d7551ee3940a66af88a393f2b862c1ee6d11b0230c00485e5b5c9e67

248 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file contains embedded JavaScript that utilizes eval() and attempts to exploit CVE-2009-4324 via media.newPlayer. The script constructs strings and arrays in a complex manner, likely to obfuscate its true purpose of triggering an exploit. The primary function of the script is to execute arbitrary code by leveraging the media player vulnerability.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 7

media.newPlayer — CVE-2009-4324 critical CVE exact CVE_2009_4324

PDF JavaScript calls media.newPlayer — CVE-2009-4324 is a use-after-free in Adobe Reader's multimedia plugin triggered by media.newPlayer(). Actively exploited as a zero-day in December 2009.
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
Generic recovered JavaScript exploit stage high PDF_GENERIC_STAGE_RECOVERY

Bounded static stage recovery exposed hidden JavaScript through generic transforms such as null-byte collapse, percent decoding, marker replacement, arithmetic character codes, fromCharCode, numeric arrays, numeric-array minus-key decoders, alphabet-index arrays, /Producer half-difference metadata arrays, hex literals, marker-stripped Base64 literals, custom 6-bit XOR table decoders, or repeated-marker hex carriers. This rule is emitted only when the recovered stage contains exploit-like Acrobat JavaScript or shellcode markers.
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.
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 5

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0005_000.js` `3ee104ef337deeb5bb9026f28eeccd43adb81f66ff79786d8b535957d58e8df2`	pdf-javascript-stream	PDF /JS object 5 at offset 0x117	1112 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).
`javascript_obj0005_001.js` `ca02d2d29a61a078e86fe8f9e778118a5673ba00c5c069052a707663f3351299`	pdf-javascript-stream	PDF /JS object 5 at offset 0x117	33 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`generic_stage_recovery_000.js` `59c4a6f1c30bdac695995e79f192523cf1bb2b6b150aeeb499e94c9d3420d73d`	deobfuscated-js	generic stage recovery split-literal-normalize from JavaScript object 5 at offset 0x117	1109 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).
`generic_stage_recovery_001.js` `a51d3a3af4c272d3614da3278662d2bf4585e7afea5df8f6e95a328af9c81c74`	deobfuscated-js	generic stage recovery split-literal-normalize from combined JavaScript objects at offset 0x117	1143 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 6 eval/decoder/string-building token(s).
`combined_document_js_000.js` `0093b9be0d7b336e51dfc2f9a21485a6dc690ca70174256b083df6125c7b20f1`	deobfuscated-js	combined document JavaScript streams at offset 0x117	1146 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 6 eval/decoder/string-building token(s).

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