PDF malware analysis — malicious · 5f8e8b1b22a67fc3

MALICIOUS

PDF

8.3 KB Created: 2009-01-35 62:12:26 Authoring application: Adobe

MD5: a872698bbb3e78e9bf43621de19603f1 SHA-1: 48dd895976f142e3eac083f13a33a6700f828f52 SHA-256: 5f8e8b1b22a67fc3a09cc5dcb72311ab1a3b1b0f64b7f6a93795a5777bc697bf

338 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF file contains embedded JavaScript that exploits multiple known vulnerabilities (CVE-2009-4324, CVE-2009-0927, CVE-2007-5659) to achieve code execution. The JavaScript is obfuscated but appears to be designed to download a second-stage payload from the URLs http://state-wa.net/e/load.php?spl=pdf_pack and http://state-wa.net/e/load.php?spl=pdf_new. The ML classifier strongly indicates maliciousness.

Machine Learning

Nyx PDF Classifier malicious score 0.9998

Heuristics 10

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)
Collab.getIcon — CVE-2009-0927 critical CVE exact CVE_2009_0927

PDF JavaScript calls Collab.getIcon — CVE-2009-0927 is a stack buffer overflow in Adobe Reader triggered by Collab.getIcon() with a crafted argument. Allows arbitrary code execution. (identified after JavaScript deobfuscation)
Collab.collectEmailInfo — CVE-2007-5659 critical CVE exact CVE_2007_5659

PDF JavaScript calls Collab.collectEmailInfo — CVE-2007-5659 is a buffer overflow in Adobe Reader triggered by a long argument or heap-sprayed message field passed to Collab.collectEmailInfo(). Part of a series of Acrobat JS API exploits. (identified after JavaScript deobfuscation)
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.
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.
String.fromCharCode low PDF_FROMCHARCODE

String.fromCharCode found — used to construct payload strings dynamically. Common in benign JavaScript libraries for codepoint manipulation, so this alone is informational; weaponised use is also caught by the dedicated fromCharCode-stage and exploit-shape rules. (matched inside decoded stream)
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://state-wa.net/e/load.php?spl=pdf_pack
- http://state-wa.net/e/load.php?spl=pdf_new

Extracted artifacts 8

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0014_000.js` `9b7d92596e695155792514d85edc517277285ae6f687ceb7b7aa98dd66e1cb00`	pdf-javascript-stream	PDF /JS object 14 at offset 0x1725	673 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`javascript_obj0015_001.js` `6829846e298adf7c480e5c598dbadbcd27185e93ad6ce9d481970139b83bf5aa`	pdf-javascript-stream	PDF /JS object 15 at offset 0x18A2	698 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`javascript_obj0016_002.js` `fb90cc18c70bd63de24f62c87d6e6b83231ec54f9c503e304cdb2535a6c1d861`	pdf-javascript-stream	PDF /JS object 16 at offset 0x1A2A	741 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`javascript_obj0017_003.js` `c6e5e10444c628e68e2a66d8d42a253e493a8f5fb14711f79bd68bddf629333c`	pdf-javascript-stream	PDF /JS object 17 at offset 0x1B91	827 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`javascript_obj0018_004.js` `3ebe24cd263cb8f5cf9e486a6fb3822b9df9733e6e4466fb2477bfe752feed50`	pdf-javascript-stream	PDF /JS object 18 at offset 0x1D71	392 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_000.js` `cd6202bed07aae3ee9a51830674121c45dd42566cc5df4698764f7893d853110`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x1D2	2938 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 6 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`legacy_pdfkit_stage_001.js` `e9c7435c197b82dffbd5381ed31a475d387a8671690273b845f4c1d4ebeb36e4`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x961	1634 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_002.js` `73beae69d19d420bd381f184dda2bde25943daac4b29f9d6e28a00b74d42bad7`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0xFCE	1800 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).

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