PDF malware analysis — malicious · 2271a9b7145036a7

MALICIOUS

PDF

39.3 KB

MD5: a9f56b8494b501870acaf60dc3f6dd70 SHA-1: 1b65ab7d23e5f5c8af4b6dfe660fa836ed4bb6b7 SHA-256: 2271a9b7145036a713f2250c418ffab7d50323a4c46aa03df09facddb304df22

218 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript and U3D content, indicating an attempt to exploit vulnerabilities. Specifically, the 'CVE_2007_5659' heuristic fired, pointing to the use of 'collab.collectEmailInfo' to decode and execute a hex-encoded JavaScript stager. This stager, recovered as 'annotation_subject_callee_hex_stage_000.js', is designed to download and execute further malicious content. The presence of U3D content also suggests a potential exploit vector.

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: Pdf.Exploit.Agent-36181 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-36181
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` `a246c68d5544a5fc390ae92571a910dee0516c54ba546b2460fd1ca6ec360799`	pdf-javascript-stream	PDF /JS object 7 at offset 0x1AD	604 bytes
`annotation_subject_callee_hex_stage_000.js` `b2f41bba0184b163a914d1f949e5ec091a7534d80b8f0b8a96f9b28df3d7d1ed`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x156	5410 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).
`u3d_00_off0000310c.bin` `0de4003a900e42a2dfc771b68a31232346c9f4f3771c57dc8bb04f4762da15d6`	pdf-3d-stream	PDF U3D 3D stream at offset 0x310C	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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