PDF malware analysis — malicious · ca675ee172b929fb

MALICIOUS

PDF

39.5 KB

MD5: a2a6291b8d5c33c85916d0f6406289d4 SHA-1: 552fa7cea7999604dab051fe1e3365a3c8d317e7 SHA-256: ca675ee172b929fb394aa01a076f0503659eafea050f1830012e203910d11345

218 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link T1204.002 Malicious File

The PDF file contains obfuscated JavaScript, indicated by the 'PDF_JAVASCRIPT', 'PDF_JS', and 'PDF_ANNOT_SUBJECT_CALLEE_HEX_STAGER' heuristics. The critical 'CVE_2007_5659' heuristic specifically points to the exploitation of a known Adobe Reader vulnerability via the 'Collab.collectEmailInfo' method to execute a JavaScript stager. This stager is likely responsible for downloading and executing a second-stage payload, as suggested by the presence of extracted JavaScript and U3D content. The file's structure and the nature of the heuristics strongly suggest a malicious intent to exploit a vulnerability and deliver further malware.

Heuristics 7

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)
U3D/3D content in PDF — Adobe Reader 3D parser CVE-family indicator high CVE related PDF_U3D_CVE_RELATED

PDF contains U3D (Universal 3D) or 3D annotation content — CVE-2011-2462 and CVE-2009-3953 are critical vulnerabilities in Adobe Reader's U3D processing that allow arbitrary code execution. U3D content in PDFs is extremely rare in normal documents.
ClamAV: Heuristics.PDF.ObfuscatedNameObject critical CLAMAV_DETECTION

ClamAV detected this file as malware: Heuristics.PDF.ObfuscatedNameObject
Annotation subject callee-key hex JavaScript stager high PDF_ANNOT_SUBJECT_CALLEE_HEX_STAGER

PDF JavaScript uses syncAnnotScan()/getAnnots() to read an indirect annotation /Subject stream, percent-decodes it through marker replacement, then uses a callee.toString()-derived key to decode and eval the final exploit stage.
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.
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.

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0007_000.js` `83c89bafa116d9c91eff0b9ebda502f5bf0baa04c36fa774c6ebc2756ba3479f`	pdf-javascript-stream	PDF /JS object 7 at offset 0x1AD	585 bytes
`annotation_subject_callee_hex_stage_000.js` `249da638bbe5c06d28abd6aa3f1e571fa2d4f9cd031340136b7de69c1fa3dbd8`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x156	5590 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).
`u3d_00_off000031ea.bin` `0de4003a900e42a2dfc771b68a31232346c9f4f3771c57dc8bb04f4762da15d6`	pdf-3d-stream	PDF U3D 3D stream at offset 0x31EA	27387 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.99, consistent with packed or encrypted content.

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