PDF malware analysis — malicious · 04552d4e905c215d

MALICIOUS

PDF

21.4 KB

MD5: 647d94c4f7b522dbc9f3709e47b93e05 SHA-1: af6102d94bd12495caafc6aff36663ec6964416c SHA-256: 04552d4e905c215df365a83e8108f66d1bfa79c4968502870cb3e9425c14b50b

150 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF file contains embedded JavaScript that exploits CVE-2009-4324 via the media.newPlayer API. This script is designed to download and execute a second-stage payload from the URL http://gwraddkkda.in/new/post.php?e=8&&. The ML classifier strongly indicates maliciousness, and the presence of shellcode download URL firings further supports this. The obfuscated JavaScript is too complex to fully deobfuscate and analyze its precise actions beyond downloading a payload.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

Heuristics 6

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)
PDF JavaScript shellcode contains an embedded download URL high PDF_JS_SHELLCODE_DOWNLOAD_URL

Decoded PDF JavaScript shellcode contains a hardcoded http(s) URL stored as little-endian %uXXXX Unicode escapes. Reader exploit shellcode embeds the second-stage fetch URL this way and pulls it down with a urlmon/URLDownloadToFile-style download-and-execute (commodity downloader behaviour rather than a specific Acrobat CVE).
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.
Embedded URL info EMBEDDED_URL

One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.

URL http://gwraddkkda.in/new/post.php?e=8&&

Extracted artifacts 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0008_000.js` `eb02e542a5034a02a941b8e7a7a997cb206126e657775a58d8a3dd41b1495526`	pdf-javascript-stream	PDF /JS object 8 at offset 0x1E7	2205 bytes
`javascript_obj0008_001.js` `04248ac041a658eae20da82e550447963f4bc9953de157320043af5a6720e644`	pdf-javascript-stream	PDF /JS object 8 at offset 0x209	21353 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).
`legacy_pdfkit_stage_000.js` `c3df0b6d669953258363ab802ac0d32c63d5685d76eb2e0ad1f70f86b924f691`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0xAB8	1256 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` `42025b552c7960b53abcd8cd732b01c8d109eccfdfefc352b9826c4d5807d414`	deobfuscated-js	cross-stage annotation API aliases at offset 0x1E7	81 bytes

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