PDF malware analysis — malicious · 86a85d14c3ec06e3

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: c1b03dabe6e461037ca51d0a6509c56e SHA-1: 65dacaab224ab032ee68f4099f025b8948d435c1 SHA-256: 86a85d14c3ec06e3f687e56f6b7f6d590ce940a2bff8664404551fad84850049

290 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file contains embedded JavaScript that exploits CVE-2009-4324 via the media.newPlayer function. The script is designed to download and execute a second-stage payload from the URL http://121.101.216.203/aaff/news.php?dd=OkExQXtfczN4c3RydVBMb11BZTZ1QmVwUitsZiFgTi9FMDVGWDhYIktCInFnXW1xQnVhVHUibisyL3NmNzlZTWl2WyJTdVJbbDE7LDY7IlpkXVkrPUZGNC1SX18iYno9eWw5KTt5biI3SzFaM0Q0S0QyQ3JTd1YiNn1uQE11KyJWIkhTKUFbMTMibHopImls. The presence of multiple deobfuscated JavaScript stages and the critical PDF_JS_EXPLOIT_CLUSTER firing indicate a high likelihood of malicious intent.

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=OkExQXtfczN4c3RydVBMb11BZTZ1QmVwUitsZiFgTi9FMDVGWDhYIktCInFnXW1xQnVhVHUibisyL3NmNzlZTWl2WyJTdVJbbDE7LDY7IlpkXVkrPUZGNC1SX18iYno9eWw5KTt5biI3SzFaM0Q0S0QyQ3JTd1YiNn1uQE11KyJWIkhTKUFbMTMibHopImls

Extracted artifacts 6

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0013_001.js` `8b9a32faa972dcfe43593facf2232a4ec1337e9b54731d851572768d9a01b265`	pdf-javascript-stream	PDF /JS object 13 at offset 0x394	2646 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).
`javascript_obj0013_002.js` `00dd5ecc088cf919957dc15068d4cfff8ed827e18de06ec86bac35a911b8f04e`	pdf-javascript-stream	PDF /JS object 13 at offset 0x3B6	3221 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` `dfdc9712a0ed2cc6b9ebd186baee0f298a807f874cd85695f8c3606d1a694426`	deobfuscated-js	generic stage recovery percent-decode from JavaScript object 13 at offset 0x394	2644 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` `6ec708209923532e7259c03f6946e9173d4b57b0fdfe6e96d6e87df1eff2c0f3`	deobfuscated-js	generic stage recovery percent-decode from JavaScript object 13 at offset 0x3B6	3219 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` `0eda4facfc96557f5283700d0f7ca9ae66ebb705603b77961e25a44c62f68095`	deobfuscated-js	generic stage recovery percent-decode from combined JavaScript objects at offset 0x16	5881 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` `466baab52cd2bc29cdcf71e87f446d38d808daccc36f5b332d1ab71e3f9dc0a9`	deobfuscated-js	combined document JavaScript streams at offset 0x16	5885 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 6 eval/decoder/string-building token(s).

Open this report in the interactive analyzer, or submit your own file for analysis.