PDF malware analysis — malicious · e8ca6e17fcb3b4a9

MALICIOUS

PDF

17.6 KB

MD5: 277556c3e5de09edae4970e0ceb116eb SHA-1: 87826ea88cbe430ddc5157c46cdce835c7b7a14c SHA-256: e8ca6e17fcb3b4a949d46179469dc13c2ad3685c0622d5c4c5397a799b2f9005

118 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

The PDF file contains embedded JavaScript that is obfuscated using string concatenation and eval() calls. Static analysis identified the use of the CVE-2009-4324 exploit (media.newPlayer), indicating an attempt to leverage a known vulnerability in Adobe Reader. The deobfuscated JavaScript likely attempts to download and execute a second-stage payload from a remote source, as suggested by the 'legacy_pdfkit_stage' artifacts.

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` `c6d3dfe36e10bc90ba9e44eb323990c66224460106567d956cbb8b4ec93880af`	pdf-javascript-stream	PDF /JS object 111711 at offset 0x18E	2727 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_obj111712_001.js` `9edf1361806f062d45176bc472d78619f5995a7c43d5e764bf7e9b90f2e0b131`	pdf-javascript-stream	PDF /JS object 111712 at offset 0xC6B	11974 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_obj111713_002.js` `ab5668b5f34fd9b60c5dcaaa62e301b9040fe3af0296b23cec4d112d467177a0`	pdf-javascript-stream	PDF /JS object 111713 at offset 0x3B67	2743 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` `27920ea41782e3de7681655436ad162917290e5898d36303bc383088d7d66d85`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0xC6B	1075 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` `88686459bd30c3f3c3fa3a87e589ecf2be7ae6e5bf5d55c9e44ceecada75e645`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0x3B67	170 bytes
`legacy_pdfkit_stage_002.js` `17f633f92fdabb952c5411515ed3c8ca962244a8cbd49ad3a6f1c0b9af80be64`	deobfuscated-js	multi-marker percent-array combined decoded JavaScript at offset 0xC6B	1246 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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