PDF malware analysis — malicious · 3b61bf932d4c0bc5

MALICIOUS

PDF

12.0 KB

MD5: e12a8912e507ed58259ebfd2b1c449fe SHA-1: 8336569aeac883a9855dfd713896020c546f4b10 SHA-256: 3b61bf932d4c0bc5be200d48595e14c7eb72c77a4dea3bb751f705f6b54841af

186 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link or Document: Malicious Link T1204.002 Malicious Link or Document: Malicious Document

The PDF file contains embedded JavaScript, triggered by the CVE-2007-5659 exploit targeting the `collab.collectEmailInfo` function. This exploit is designed to execute arbitrary code, and the presence of multiple deobfuscated JavaScript files indicates a complex execution chain. The primary function appears to be the staging and execution of a malicious payload.

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)
ClamAV: Pdf.Exploit.Agent-36063 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-36063
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.
syncAnnotScan annotation-staging primitive low PDF_FOXIT_SYNCANNOTSCAN

PDF JavaScript calls syncAnnotScan() — a no-op annotation-enumeration primitive used by exploit-kit JavaScript to stage payload reads from annotation /Subject fields before eval(). Not a vulnerable sink itself; rarely seen in legitimate PDFs. (matched in decompressed 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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0007_000.js` `eb39e2de4dbbc100de6d3e30aa43ff78fa075618862ba1ebba5151ea3a3b848d`	pdf-javascript-stream	PDF /JS object 7 at offset 0x19D	273 bytes
`annotation_subject_callee_hex_stage_000.js` `4562f6de46b0f0e135cc9f1cee75ba5ee7e5513ecf67e1c5d10d11e5b716549e`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x14A	5124 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_001.js` `8520e61e507a56915b82357987c59008b5ed8ddbfc6357a5736d1c34c8193136`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2D6	12136 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`deobfuscated.js` `bf4a98167e2db9981dbd16ddfe60eaf07d11ef6c5413d05cb6d63b8c27efacd7`	deobfuscated-js	PDF JavaScript deobfuscation pass	78113 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).

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