PDF malware analysis — malicious · 054b092db12ae5de

MALICIOUS

PDF

4.1 KB Created: 2008-31-20 53:85:00 Authoring application: Scribus 1.3.3.12 (via Scribus PDF Library 1.3.3.12)

MD5: 0e8726d6c870fd1683630fcf6d069389 SHA-1: 9c7b0bd3926221ede9c2f3b14030290eb81eda37 SHA-256: 054b092db12ae5de5ebc2e67828e53f5c0166053367d82e1402ccad3d338a2c3

290 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF sample contains embedded JavaScript that exploits CVE-2009-4324 (media.newPlayer). The script is designed to download a second-stage payload from the URL http://121.101.216.203/aaff/news.php?dd=OkExQXtfczN4c3RyeDtgXTZBZTZ1QmVwNiBeRzBlcC9FMDVGWDhYInJWInFnXW1xQnVhVHUibisyL3NmNzlZTWl2WyJTdVJbbDE7LDY7IlpkMHNGPXc0KGlURFEiYno9eWw5KTt5biI3SzFaM0Q0S0QyQ3JTd1YiNn1%2BPi4kKyJWIkhTfUA5czMibHopImls. This indicates a typical downloader or exploit delivery mechanism.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 9

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.
PDF JavaScript exploit cluster critical PDF_JS_EXPLOIT_CLUSTER

PDF combines an executable JavaScript/action surface with exploit staging indicators such as eval/unescape/fromCharCode, XFA script content, or a related CVE pattern. Benign form JavaScript remains low-severity, but this correlated cluster is high-confidence malicious behavior.
unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits
Generic recovered JavaScript exploit stage high PDF_GENERIC_STAGE_RECOVERY

Bounded static stage recovery exposed hidden JavaScript through generic transforms such as null-byte collapse, percent decoding, marker replacement, arithmetic character codes, fromCharCode, numeric arrays, numeric-array minus-key decoders, alphabet-index arrays, /Producer half-difference metadata arrays, hex literals, marker-stripped Base64 literals, custom 6-bit XOR table decoders, or repeated-marker hex carriers. This rule is emitted only when the recovered stage contains exploit-like Acrobat JavaScript or shellcode markers.
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://121.101.216.203/aaff/news.php?dd=OkExQXtfczN4c3RyeDtgXTZBZTZ1QmVwNiBeRzBlcC9FMDVGWDhYInJWInFnXW1xQnVhVHUibisyL3NmNzlZTWl2WyJTdVJbbDE7LDY7IlpkMHNGPXc0KGlURFEiYno9eWw5KTt5biI3SzFaM0Q0S0QyQ3JTd1YiNn1%2BPi4kKyJWIkhTfUA5czMibHopImls

Extracted artifacts 7

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0001_000.js` `0462b88680a1898588df97f0603d1df563db761dc9142d03ef12a4c1f4f91332`	pdf-javascript-stream	PDF /JS object 1 at offset 0x16	32 bytes
`javascript_obj0013_001.js` `0cb89cb81b4ab156850bf11b2cd94f5bdced3c229decaf229f2eef566a408790`	pdf-javascript-stream	PDF /JS object 13 at offset 0x3A4	2614 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).
`javascript_obj0013_002.js` `9cd592699d43f3b9a346f3144a21b7e072e55b5a9a8c4887b6b9b6d03a653950`	pdf-javascript-stream	PDF /JS object 13 at offset 0x3C6	3189 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).
`generic_stage_recovery_000.js` `695ed3f7d08e360db46446e39409cd100feb5d9331e9a746c1c206e46c87095c`	deobfuscated-js	generic stage recovery percent-decode from JavaScript object 13 at offset 0x3A4	2612 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).
`generic_stage_recovery_001.js` `e162263e8d0b6d2d7fdee05f82f527748d1739d298b360457ff886da676fd285`	deobfuscated-js	generic stage recovery percent-decode from JavaScript object 13 at offset 0x3C6	3187 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).
`generic_stage_recovery_002.js` `0f9d2071312863baf82d7ed80575d18d626e34aa18cbb4fd57baf2ebc4eccffe`	deobfuscated-js	generic stage recovery percent-decode from combined JavaScript objects at offset 0x16	5833 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 6 eval/decoder/string-building token(s).
`combined_document_js_000.js` `8c15c43894f32d1e1fc7a3606e77c8e131197b7ebcc1e5a798ae756c471f8260`	deobfuscated-js	combined document JavaScript streams at offset 0x16	5837 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 6 eval/decoder/string-building token(s).

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