PDF malware analysis — malicious · 7f24a035559daacb

MALICIOUS

PDF

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

MD5: cb9da3ce624c66cda70c9ba84b7e0040 SHA-1: 98b177cc4c76232bd3a45cd2b57c52a0916cfbc9 SHA-256: 7f24a035559daacb1a9c17a4739a9764d3e9811ca5f1bf98b12c8eb33075041e

230 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 (media.newPlayer vulnerability). This exploit is designed to execute arbitrary code, and the presence of multiple deobfuscated JavaScript stages suggests a downloader or dropper functionality. The ML classifier strongly indicates malicious intent.

Machine Learning

Nyx PDF Classifier malicious score 0.9998

Heuristics 11

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. (matched in decompressed stream)
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.
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. (matched inside decoded stream)
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` `97e6c8fb70f6fedab160a41095c99dce3c9d53a0086d3a8d4e6d47cbe03dce61`	pdf-javascript-stream	PDF /JS object 17 at offset 0x457	1946 bytes
`javascript_obj0019_001.js` `f8fa5090f403a23bc5ee29904e8cdf5a66288cdd6b424e7c64f611e32364ce3c`	pdf-javascript-stream	PDF /JS object 19 at offset 0xCA7	2682 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).
`javascript_obj0024_002.js` `5f81fc13daea715a4d6828e16c4918d0823240ee585ff555d25b58db0c5dfcaf`	pdf-javascript-stream	PDF /JS object 24 at offset 0x693CD	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).
`stream_003_off00000457.js` `5c1ab2af46eef55b0d162c3a84464633475df9b138b64aa21a36ffaffbdffa88`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x457	1336 bytes
`generic_stage_recovery_000.js` `4feeacdef20c643e71fe7279399aa796aecb593be0f9c26ed27f4200036308e8`	deobfuscated-js	generic stage recovery split-literal-normalize from JavaScript object 19 at offset 0xCA7	2679 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_001.js` `88165c43dbb7f8f570a046307e600ca5fc4850912920c9b1980160e4230d7d62`	deobfuscated-js	generic stage recovery null-collapse from combined JavaScript objects at offset 0x457	6525 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 2 long base64-like blob(s).
`generic_stage_recovery_002.js` `f0cc5223672af823870eccdb22552f72395fc650500124dd6cf2a99bbc163d18`	deobfuscated-js	generic stage recovery split-literal-normalize from combined JavaScript objects at offset 0x457	7310 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 2 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 0x693CD	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` `892e451654379ccd24fb7815d8dd84e2d65e78ba077fde2360d9e6a23c02d378`	deobfuscated-js	generic stage recovery null-collapse -> split-literal-normalize from combined JavaScript objects at offset 0x457	6519 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 2 long base64-like blob(s).
`combined_document_js_000.js` `b8bc2f78e194f1964fbaa19d5b73d5fe88eda1a1f064067c75cf5cb3def91e91`	deobfuscated-js	combined document JavaScript streams at offset 0x457	7316 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 2 long base64-like blob(s).

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