PDF malware analysis — malicious · c55cfe8bd2839bb2

MALICIOUS

PDF

12.2 KB

MD5: 5b6fcda1dcd9387e7d5ce5c1387e78cf SHA-1: f84be533cfd0d2464e30c642df6158de69c28239 SHA-256: c55cfe8bd2839bb207ccdf82acc1c3a36ffe6e60371b3afc5d4226a78531b9e1

156 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF file contains embedded JavaScript, identified as a stager by the 'PDF_ANNOT_SUBJECT_CALLEE_HEX_STAGER' heuristic. This script is obfuscated and uses a hex decoder, indicating it's designed to download and execute a second-stage payload. The critical 'CVE_2007_5659' heuristic confirms the exploitation of a vulnerability related to 'Collab.collectEmailInfo' to achieve this execution. The presence of JavaScript actions and streams within the PDF further supports this attack vector.

Heuristics 5

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)
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.
Suspicious extracted artifact high 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.
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.

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0007_000.js` `0df291d69669aabea8d48539ff6e3447b14e49a861871000e6476334f075bd19`	pdf-javascript-stream	PDF /JS object 7 at offset 0x1A6	1011 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`annotation_subject_callee_hex_stage_000.js` `b61501a1187b7e5ca91cd36d80b41491cbf67a3e09062c24356f10630fb4db80`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x14F	5147 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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