PDF malware analysis — malicious · 63f6d68ca88a1816

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: 8b0c2a6d99442690764458c715b981dd SHA-1: 618a3d147b92f2c394eb10b7f972acbc1f5a52d1 SHA-256: 63f6d68ca88a18167c0641144269d7260a4ea3186028757b3b0c0659aef530f9

290 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 using the media.newPlayer object. The script attempts to download a second-stage payload from the URL http://121.101.216.203/aaff/news.php?dd=OkExQXtfczN4c3RyLS5ROWJBZTZ1QmVwJjxmVHsuMC9FMDVGWDhYIktCInFnXW1xQnVhVHUibisyL3NmNzlZTWl2WyJTdVJbbDE7LDY7IlpkWU9ZaHdVRlhzOXIiYno9eWw5KTt5biI3SzFaM0Q0S0QyQ3JTd1YiNn16NCtwKyJWIkhTdld4XTMibHopImls. This indicates a downloader or initial access exploit.

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=OkExQXtfczN4c3RyLS5ROWJBZTZ1QmVwJjxmVHsuMC9FMDVGWDhYIktCInFnXW1xQnVhVHUibisyL3NmNzlZTWl2WyJTdVJbbDE7LDY7IlpkWU9ZaHdVRlhzOXIiYno9eWw5KTt5biI3SzFaM0Q0S0QyQ3JTd1YiNn16NCtwKyJWIkhTdld4XTMibHopImls

Extracted artifacts 6

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0013_001.js` `5059d58e8a98fbcb1f15fd50813e79c92e3d9de8180cc79c1475f55dd552615b`	pdf-javascript-stream	PDF /JS object 13 at offset 0x395	2643 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).
`javascript_obj0013_002.js` `4c78e2c9f7cac3d824c940039176be0e6bc7c1429fffbc0a92a1340510d26613`	pdf-javascript-stream	PDF /JS object 13 at offset 0x3B7	3218 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` `7de5b103c27c13400703ab0ab5381095bffcd67f6db813eab01542c6b9c6a8ac`	deobfuscated-js	generic stage recovery percent-decode from JavaScript object 13 at offset 0x395	2641 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` `ac76e217ac18f4f42b7b06825f41957f7b1e29e133492164eaaa7ff08984b2b2`	deobfuscated-js	generic stage recovery percent-decode from JavaScript object 13 at offset 0x3B7	3216 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` `750762e8e58414d135fe5af564ecf15e59f6b09762b2602d5ee3069344eb79d8`	deobfuscated-js	generic stage recovery percent-decode from combined JavaScript objects at offset 0x16	5876 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` `44f7253ec54dd70883817d0e693a86d82895132a1e600306c332e96787a71329`	deobfuscated-js	combined document JavaScript streams at offset 0x16	5880 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 6 eval/decoder/string-building token(s).

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