PDF malware analysis — malicious · 02b57ec1288c31b7

MALICIOUS

PDF

181.8 KB

MD5: 804aaef05eb35d5ef94e55a0747e1c67 SHA-1: ed164c60b083363914bd14d092d18757897ed912 SHA-256: 02b57ec1288c31b73a08bdfe4ce367bb670e085a3f7176563234937612a7f7ba

312 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The PDF file contains embedded JavaScript that is obfuscated and utilizes the unescape function, indicating malicious intent. Critical heuristics like 'PDF_JS_EXPLOIT_CLUSTER' and 'CVE_2009_4324' confirm the exploitation of a known vulnerability (media.newPlayer) to execute code. The embedded JavaScript is designed to download and execute a secondary payload, as evidenced by the generic stage recovery scripts.

Machine Learning

Nyx PDF Classifier malicious score 0.9984

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. (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.
Secondary embedded PDF body has suspicious static findings critical POLYGLOT_CHILD_PDF_STATIC_TRIAGE

A valid PDF body was found at a nonzero offset inside another container and its carved contents matched PDF exploit or lure heuristics. This catches polyglots where the top-level magic routes to ZIP/OLE while a PDF reader or downstream parser opens the hidden PDF payload.
unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits (matched inside decoded stream)
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.
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/xap/1.0/mm/
- http://ns.adobe.com/pdf/1.3/

Extracted artifacts 11

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0057_000.js` `eae10c2d1846ed108dbd322fa8001738199732b4fe8b3355e360a1f3532eb5fd`	pdf-javascript-stream	PDF /JS object 57 at offset 0x551F	2102 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`stream_005_off00000b74.bin` `e4217c167299ac63f64b8b7e903cc0196f0828693d273431b8b793a12ed0fed3`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0xB74	1000 bytes
`generic_stage_recovery_000.js` `b93e8ecdf0788df91556b0fbf10c3e0d25f9728455da3a58133cd8dd2ff231ec`	deobfuscated-js	generic stage recovery split-literal-normalize from JavaScript object 57 at offset 0x551F	2099 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`generic_stage_recovery_001.js` `baa9e2c3862a7c99c7c545f4aea2ffda085566084afc904dc097ec99e78103f0`	deobfuscated-js	generic stage recovery percent-decode from JavaScript object 57 at offset 0x551F	2098 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`generic_stage_recovery_002.js` `6d7bd4a28343765f1a9af16b92e3902188564512a1e8a50df6c699f1af8d2c52`	deobfuscated-js	generic stage recovery marker-XX-to-%u from JavaScript object 57 at offset 0x551F	1788 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).
`generic_stage_recovery_003.js` `71fe503a96798dac812f6388728918a3fcdd0ce1abeea34bbe81fa4a153ba77a`	deobfuscated-js	generic stage recovery percent-decode from JavaScript object 57 at offset 0x551F	1784 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).
`generic_stage_recovery_004.js` `8791ba85121d7081f904c2e03c71c3403f45306ee69748bd581b9c6bc77898d3`	deobfuscated-js	generic stage recovery split-literal-normalize -> percent-decode from JavaScript object 57 at offset 0x551F	2095 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`generic_stage_recovery_005.js` `3f4144e71a12a073af4d0726cd63c0d7d6767839057693c02b2f0f5594ba341b`	deobfuscated-js	generic stage recovery split-literal-normalize -> marker-XX-to-%u from JavaScript object 57 at offset 0x551F	1785 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).
`generic_stage_recovery_006.js` `03dc9d848c40bd19d32af29ef00174f71f1df723e153060b1a8e0befe2b6370b`	deobfuscated-js	generic stage recovery split-literal-normalize -> percent-decode from JavaScript object 57 at offset 0x551F	1781 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).
`objstm_0053_00.bin` `f9797d0fa28384c30d8bf1da89163104ce539753e417fa1f9c5fd135d1eceb39`	pdf-objstm-decoded	PDF /ObjStm 53 0 obj (inflated)	50 bytes
`polyglot_child_pdf_off00026b73.pdf` `19a460963f66e25a89b47cb1971eb13098f8d69d76275e5e2a273e2e7ae1fdfb`	polyglot-child-pdf	Secondary PDF body inside pdf container at offset 0x26B73	27598 bytes

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