PDF malware analysis — malicious · 43f249a38071568b

MALICIOUS

PDF

17.9 KB

MD5: dc32879a8ed81096766592d3639c0198 SHA-1: 66b377318a9851fdbb2c18b5e45596c47ecc7941 SHA-256: 43f249a38071568ba94bbc1755ec0e26d5fccb37c2f8c98eceaadc0a22a269ed

148 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

The PDF sample contains obfuscated JavaScript, including multiple eval() and unescape() calls, indicating an attempt to hide malicious code. The critical CVE-2009-4324 heuristic confirms the exploitation of a known vulnerability. The deobfuscated JavaScript suggests the primary goal is to download and execute a secondary payload, likely from a remote source, which is a common technique for initial access and further infection.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 5

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. (identified after JavaScript deobfuscation)
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution
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 6

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj111711_000.js` `c511d0bb671fc128325f19de9d2541d076708d7286046cfe38ea5143b4658433`	pdf-javascript-stream	PDF /JS object 111711 at offset 0x18E	2510 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 6 long base64-like blob(s).
`javascript_obj111712_001.js` `fd303eb0d9044334a19741db9f5223d8f65911d425f9a8f0e0e682351a7c8cf1`	pdf-javascript-stream	PDF /JS object 111712 at offset 0xB92	13023 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 5 long base64-like blob(s).
`javascript_obj111713_002.js` `bd40b58346113e7374febed1c1dcbff2045d6a9d0fb49e4eb97b0be1253b876c`	pdf-javascript-stream	PDF /JS object 111713 at offset 0x3EA7	2227 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 6 long base64-like blob(s).
`legacy_pdfkit_stage_000.js` `3cece914b914841a8b17f6d40f0553e78ef8ed60e76aa68605abeae7e560099e`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0xB92	1081 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_001.js` `0a27445214f9aacc20758a514723791f121d7fa2a2aeaa5683308c07597f9597`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0x3EA7	166 bytes
`legacy_pdfkit_stage_002.js` `1abc45655dabe27d20fbd4edf9dd96423038c28844bf28f88002096314358a1b`	deobfuscated-js	multi-marker percent-array combined decoded JavaScript at offset 0xB92	1248 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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