PDF malware analysis — malicious · 1414f08307ee7584

MALICIOUS

PDF

427.3 KB Created: 2009-12-16 21:50:36 +08:00 Authoring application: PDF Editor - Foxit Software

MD5: 370e8da7643f83417b936c9a6ce76298 SHA-1: ef269898ebf10135b40b45cf8f0e8e6c9d9c1037 SHA-256: 1414f08307ee75842f9e4a7584e129c47b07f2eabbc6bea8a7ffc0121fac3189

290 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1059.007 JavaScript T1105 Ingress Tool Transfer

This PDF file contains embedded JavaScript that exploits CVE-2009-4324 (media.newPlayer). The JavaScript is heavily obfuscated but appears to be designed to download and execute a second-stage payload. A critical heuristic identified an embedded Windows executable payload within a PDF stream, and another heuristic indicated generic JavaScript exploit stage recovery. The primary IOC is the embedded executable file.

Machine Learning

Nyx PDF Classifier malicious score 0.9998

Heuristics 12

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.
Embedded Windows executable payload in PDF stream critical PDF_EMBEDDED_PE_PAYLOAD

PDF stream bytes contain an embedded Windows executable with a verified PE header. Exploit chains often hide droppers inside ordinary streams rather than standard /EmbeddedFile attachments.
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.
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.
Embedded file low PDF_EMBEDDED

PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload
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.
PDF paints image(s) but contains no text operators info PDF_IMAGE_ONLY_LURE

PDF has 1 image XObject(s) and the content stream contains no text-emitting operators (BT/ET, Tj, TJ, ', ") in either raw bytes or decompressed streams — this is the screenshot-as-PDF pattern used to bypass text-based scanners and to deliver instructions purely through rendered pixels. It is informational unless paired with invisible links or risky URI context.
Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL

The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
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://www.w3.org/1999/02/22-rdf-syntax-ns#
- http://ns.adobe.com/xap/1.0/
- http://purl.org/dc/elements/1.1/
- http://ns.adobe.com/pdf/1.3/
- http://ns.adobe.com/xap/1.0/mm/

Extracted artifacts 10

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0017_000.js` `4f590eab76e915b914e0ca555a9c5cc45d398f526b69829480e431f3e8b5a1a1`	pdf-javascript-stream	PDF /JS object 17 at offset 0x457	2045 bytes
`javascript_obj0024_001.js` `5f81fc13daea715a4d6828e16c4918d0823240ee585ff555d25b58db0c5dfcaf`	pdf-javascript-stream	PDF /JS object 24 at offset 0x69A09	2686 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`embedded_pdf_00001e91.exe` `3b8969d87ace918d4949ba32453ef889601e7a421a46ce2126b590817099ec00`	embedded-pe	PDF raw stream PE payload at offset 0x1E91	416213 bytes
`generic_stage_recovery_000.js` `f8ef7451905648deb173ddf80a215ac1106b99b64e6709953d574ff867fe0ab7`	deobfuscated-js	generic stage recovery split-literal-normalize from raw PDF metadata at offset 0x0	262144 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 3 long base64-like blob(s).
`generic_stage_recovery_001.js` `9f28ac043e719f7717329198350b85bdb23bd11264c131a95cdefd1ca62387bc`	deobfuscated-js	generic stage recovery null-collapse from combined JavaScript objects at offset 0x457	2689 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`generic_stage_recovery_002.js` `6fc62ed441c591e222d0b63fc59aeb9f5e22ccaab54e43bea62dc6855fd5dcfc`	deobfuscated-js	generic stage recovery split-literal-normalize from combined JavaScript objects at offset 0x457	4729 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`generic_stage_recovery_003.js` `83b46f5ec8314ba4ec2f9a344971e5dbe699d6c9b4fbdde91c5fb9a8be8de2df`	deobfuscated-js	generic stage recovery split-literal-normalize from JavaScript object 24 at offset 0x69A09	2683 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`generic_stage_recovery_004.js` `2d500c65a37eac0a60855778d8a671152330874bfd14a1c7319b14f3a2ee0fea`	deobfuscated-js	generic stage recovery split-literal-normalize from decompressed stream at 0x0 at offset 0x0	262144 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 3 long base64-like blob(s).
`generic_stage_recovery_005.js` `90c08191e213ee17a0a37e8cb55e25043df6f16d399eb3e948941741ea326a5f`	deobfuscated-js	generic stage recovery null-collapse -> split-literal-normalize from combined JavaScript objects at offset 0x457	2686 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`combined_document_js_000.js` `ceb89e178384e2dbbfb830dbb1c1b52563333f7e0ea02e076e724ee7edaec3a0`	deobfuscated-js	combined document JavaScript streams at offset 0x457	4732 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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