PDF malware analysis — malicious · 2b72992d74cc223b

MALICIOUS

PDF

129.7 KB

MD5: 8539b41f87100edd39ee0b3780ca51be SHA-1: 41f1da7ddf26ed0e588ac5ed6110b7fe749c5dac SHA-256: 2b72992d74cc223b3bd65b9fe27b239bd3699b13e5812a37934de11fbcea183f

136 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File T1059.001 PowerShell

The PDF sample contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The critical CVE_2009_4324 heuristic firing points to the use of the media.newPlayer API, a known exploit vector. The PDF_UNESCAPE heuristic suggests obfuscation techniques were used to hide the malicious JavaScript. The extracted JavaScript file, legacy_pdfkit_stage_000.js, likely contains the code to download and execute a secondary payload, although its exact function is obscured.

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)
unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits (matched inside decoded stream)
Suspicious extracted artifact medium 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.
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.

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0008_000.js` `7f66313a5cb4a69b3db86b789536193efe31d9f5ef06214e8220eb828355458d`	pdf-javascript-stream	PDF /JS object 8 at offset 0x210	2960 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s). Carved artifact contains 3 long hex-escaped blob(s).
`legacy_pdfkit_stage_000.js` `42c3f4df375ff6f58ff655cc4f88b5cc28f0dd33b978390db3538684a6219b74`	deobfuscated-js	string-concatenation normalized Acrobat API aliases at offset 0x210	126 bytes

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