PDF malware analysis — malicious · 1d257b0e2a7c3336

MALICIOUS

PDF

38.8 KB

MD5: 8c977fa06fa9bae58757ed0f412c47db SHA-1: ff7fb88484f4cbd649284cbeb05cd36377b3cc7b SHA-256: 1d257b0e2a7c33364fe3a658eb9422aa1813d1374d69a2ef29ae63df6d8f9707

226 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File T1059.001 PowerShell

The PDF file contains embedded JavaScript, specifically a stager triggered by the CVE-2007-5659 vulnerability related to `Collab.collectEmailInfo`. This stager is heavily obfuscated but appears to be designed to download and execute a second-stage payload. The presence of U3D content also indicates a potential exploit vector. ClamAV detection further confirms its malicious nature.

Heuristics 8

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-36088 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-36088
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.
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)
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` `9fd87306e37a04c361ea1b68a1cf4474b7a018e2270929a8c382cd129d8fc406`	pdf-javascript-stream	PDF /JS object 7 at offset 0x1A3	566 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`annotation_subject_callee_hex_stage_000.js` `885b84511480f38e16829506e533b49d51213bcb340ae5c58c3f2c2b87a23bad`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x151	5491 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).
`u3d_00_off00002eea.bin` `0de4003a900e42a2dfc771b68a31232346c9f4f3771c57dc8bb04f4762da15d6`	pdf-3d-stream	PDF U3D 3D stream at offset 0x2EEA	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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