PDF malware analysis — malicious · 98d1019a14fa6ffb

MALICIOUS

PDF

19.7 KB

MD5: de207977dd817119d8c6ad3363863203 SHA-1: 123697f05add416966428f8094778e1a692440a9 SHA-256: 98d1019a14fa6ffbc0fa53716de5d472d8d254eb4239c56fef0c8f38e3ce0c7b

148 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

The PDF file contains obfuscated JavaScript, including multiple eval() calls and string concatenations, which is a common technique for delivering malicious payloads. The critical heuristic firing for CVE_2009_4324 indicates a known exploit for Adobe Reader. The embedded JavaScript streams and deobfuscated stages suggest the script's purpose is to download and execute a secondary payload, leveraging the identified exploit. The ML classifier strongly supports the malicious nature of this PDF.

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` `16af83dda4ecc4895ebcb902902fb607aa988f970763cfc758e947210e104e2c`	pdf-javascript-stream	PDF /JS object 111711 at offset 0x18E	2971 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` `75bbcb2a58a09c768cc69e7eaa5fd97561185336cd221f7603d79a0b81a14e97`	pdf-javascript-stream	PDF /JS object 111712 at offset 0xD5F	13946 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` `562a7dfb9c6e04fef43149f344a078d86cd955a3ddf954d8a4286b1c4d588ccc`	pdf-javascript-stream	PDF /JS object 111713 at offset 0x440F	2683 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).
`legacy_pdfkit_stage_000.js` `592f6a62da95a640af08a6334a95a42bfef702832b01633f49776040226e52c0`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0xD5F	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` `cd7088aa0ba5ce42db7faac79c4063dccc339c8953139714658e9cb6b07c91fc`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0x440F	165 bytes
`legacy_pdfkit_stage_002.js` `c47e5d4d5381fd874dc4ed46f979f7f9cc5d813f1ad935a2b0d9416ce01c1ce2`	deobfuscated-js	multi-marker percent-array combined decoded JavaScript at offset 0xD5F	1247 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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