PDF malware analysis — malicious · 5cabfd4fec212d25

MALICIOUS

PDF

43.3 KB

MD5: 74092f5e613073d2f6efad70d239b98d SHA-1: b68c439708fa61b145f185216614e7f01c0d1173 SHA-256: 5cabfd4fec212d25321bad56c59da3f52061ae8ae77d82f0edb4df3a54e2e658

150 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF sample contains embedded JavaScript that leverages the CVE-2009-4324 vulnerability via the media.newPlayer API. This script is designed to download and execute a secondary payload from the URL http://anilistico.net.in/and/post.php?e=8&&. The ML classifier strongly indicates maliciousness, and the presence of shellcode download functionality confirms a multi-stage 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://anilistico.net.in/and/post.php?e=8&&

Extracted artifacts 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0008_000.js` `7057fe6913d2257e7b0bb7a7cd588ef5a19763556297742fe783e09e13ee1b97`	pdf-javascript-stream	PDF /JS object 8 at offset 0x1E7	2221 bytes
`javascript_obj0008_001.js` `35d7c814d2b53b5e46a1411a4dd4ad3c48799b978f66ea5b3176d0588b252e85`	pdf-javascript-stream	PDF /JS object 8 at offset 0x209	43869 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).
`legacy_pdfkit_stage_000.js` `34724b4176b0e989bf73d0fc9ae205c6fc8236b3698a34a94365aab3ab91b629`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0xAC8	2756 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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