PDF malware analysis — malicious · 6fda96be64105c7e

MALICIOUS

PDF

40.5 KB

MD5: 13489305abd3836623325d1edbecf7f6 SHA-1: 80ad198a75371306d854e07d2759980d62a0bf74 SHA-256: 6fda96be64105c7ebcfce3acb2641773b316da149198e2a1a1679d5b0e3cbece

150 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF contains embedded JavaScript that exploits CVE-2009-4324 using the media.newPlayer API. This script is designed to download and execute a second-stage payload from the URL http://nationsr.in/sss/post.php?e=8&&. The ML classifier strongly indicates maliciousness, and the combination of exploit and download URL points to a downloader or initial access stage of a larger attack.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

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://nationsr.in/sss/post.php?e=8&&

Extracted artifacts 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0008_000.js` `1d3e991ca4c6efef7044c5b16e8b1830ce7bf34fd63561b048cc5b53d8fa4da7`	pdf-javascript-stream	PDF /JS object 8 at offset 0x1E7	2461 bytes
`javascript_obj0008_001.js` `18b97f082a088b323e78056db2fceb54bcd17dc9f4ed3614aa76727a71477e25`	pdf-javascript-stream	PDF /JS object 8 at offset 0x209	40959 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).
`legacy_pdfkit_stage_000.js` `ef0e35cb8c5457ba19227b4344632e10b51e16ad1533b2cc631fe6a3c319a18a`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0xBB8	2546 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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