PDF / .IRP malware analysis — malicious · 156c43b80739fbc1

MALICIOUS

PDF / .IRP

81.4 KB

MD5: 3d1d6d5a5e34c37524ae2c8911f24e8d SHA-1: 2add249aa852c5a4c3b2da87627f1f48ae7fd599 SHA-256: 156c43b80739fbc1c937360fc0f23219af894bd67730103a31e2b60a9ca63ac5

432 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF file contains embedded JavaScript that triggers multiple known Adobe Reader vulnerabilities, specifically CVE-2007-5659 and CVE-2009-4324. This JavaScript is designed to execute a secondary stage, likely a payload downloader, as indicated by the 'generic stage recovery' heuristics and the presence of obfuscated JavaScript streams. The exploitation of these CVEs is the primary malicious function observed.

Machine Learning

Nyx PDF Classifier malicious score 0.9807

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. (matched in decompressed stream)
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.
Multi-CVE Adobe Reader JavaScript exploit kit critical PDF_ADOBE_READER_MULTI_CVE_JS_KIT

One recovered JavaScript stage contains multiple version-gated Adobe Reader exploit branches. This is stronger evidence than independent API keywords: the PDF is selecting old Reader vulnerabilities by viewer version and running heap-sprayed Acrobat JavaScript exploit paths.
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.
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (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. (matched inside decoded stream)
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. (matched inside decoded stream)
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 9

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`stream_010_off00002a3f.js` `8edab7f5d6d3bc708c0e9328083b0354959e8f9d631fb43c0c99d34c90d4eac9`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x2A3F	6731 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 7 eval/decoder/string-building token(s). Carved artifact contains 2 long base64-like blob(s).
`generic_stage_recovery_000.js` `316f35b1a22e108bed4ccfb5a8333187723c66f41396d3e6a3f817f3445082c4`	deobfuscated-js	generic stage recovery split-literal-normalize from decompressed stream at 0x2A3F at offset 0x2A3F	6617 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 7 eval/decoder/string-building token(s). Carved artifact contains 2 long base64-like blob(s).
`generic_stage_recovery_001.js` `108d470302234877ecb430e64e1a1c67bbb3aa601b90d206787cc43236da10aa`	deobfuscated-js	generic stage recovery marker-XX-to-%u from decompressed stream at 0x2A3F at offset 0x2A3F	6095 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).
`generic_stage_recovery_002.js` `ca66284ab426a92ae1b146fc455bbab004c68070d67864af0b6f7d342d7bb7c8`	deobfuscated-js	generic stage recovery marker-XX-to-%u from decompressed stream at 0x2A3F at offset 0x2A3F	2421 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).
`generic_stage_recovery_003.js` `e4af8ad051735bcbddf7852e4103407928ff822bc1d1df93efaabbcfd4bc1d8b`	deobfuscated-js	generic stage recovery split-literal-normalize -> marker-XX-to-%u from decompressed stream at 0x2A3F at offset 0x2A3F	5981 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).
`generic_stage_recovery_004.js` `478fbc01c1adc9086a3981240b76d605ac0028892a29473d8992c196e9ee1961`	deobfuscated-js	generic stage recovery split-literal-normalize -> marker-XX-to-%u from decompressed stream at 0x2A3F at offset 0x2A3F	2307 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).
`objstm_0029_00.bin` `dc0fc170b1d5882fa1a67739f64e17705521fdd85dd8316c748159eb3ee59b0c`	pdf-objstm-decoded	PDF /ObjStm 29 0 obj (inflated)	457 bytes
`objstm_0047_00.bin` `fb30dcc1b952dafe4c4dfef9cc7c3163f6cc551f3579bbfec1223b6e550c625b`	pdf-objstm-decoded	PDF /ObjStm 47 0 obj (inflated)	32 bytes
`polyglot_child_pdf_off0000ff4e.pdf` `a1fd528f7b9854f0227000971505d5095c541eaf2d461706f6ec5ecb1d327c69`	polyglot-child-pdf	Secondary PDF body inside pdf container at offset 0xFF4E	18042 bytes

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