PDF malware analysis — malicious · 3f623fb9b71354a9

MALICIOUS

PDF

18.5 KB

MD5: cae94d2a48862f1398df0fded46ab38a SHA-1: b9329be9e62ba6e396d5f0eb5ccc7396498c681a SHA-256: 3f623fb9b71354a978f77911bea84317e9b0be85a5cc180a126b928acfe25db2

118 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

The PDF sample exploits CVE-2009-4324 using obfuscated JavaScript. The critical heuristic firing indicates the use of `media.newPlayer` to trigger the exploit. The embedded JavaScript, particularly the deobfuscated stages, utilizes `eval()` and `unescape()` functions, suggesting it's designed to download and execute a secondary payload. The obfuscation techniques and the specific CVE targeted point towards a downloader or exploit kit.

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` `330dfe3c0c18f9b55c6b047735c23279de579bd8f1ab12e8de550dfebbd2b3cf`	pdf-javascript-stream	PDF /JS object 111711 at offset 0x18E	2717 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 4 long base64-like blob(s).
`javascript_obj111712_001.js` `94ffbdc1a2055630c632eaac21f50845f6d984635d9625b435805bf2e90a43c7`	pdf-javascript-stream	PDF /JS object 111712 at offset 0xC61	13167 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` `968a68582b850bf8d755bcad8367c17ee85476d9b63a80e2972f8d404d5bfe5b`	pdf-javascript-stream	PDF /JS object 111713 at offset 0x4006	2434 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 4 long base64-like blob(s).
`legacy_pdfkit_stage_000.js` `f2b22a27bf03cf94e98576627d4dcd7dd81eebd745dbae7ca9214eefab853daa`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0xC61	1088 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` `26ccb4744219725f4bb5aac70f7e92475d46d222532e3b14be2751c22d459881`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0x4006	171 bytes
`legacy_pdfkit_stage_002.js` `21e6663ba33815dcc664600ba9f8ef3ab5e7c97f77ca0f4c9339e248c8a62ce5`	deobfuscated-js	multi-marker percent-array combined decoded JavaScript at offset 0xC61	1260 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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