PDF malware analysis — malicious · 858c0555114c2bf2

MALICIOUS

PDF

11.9 KB

MD5: bb7d4757fac514433a9e383137060046 SHA-1: c77e5d7f58aa5ba59e778a3da599b17244ca071d SHA-256: 858c0555114c2bf2fa78d46f6d11e6cfdad622ea704d102a0f53179b6681b14b

178 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript T1204.002 Malicious File T1071.001 Web Protocols

The PDF file contains embedded JavaScript, identified by the 'PDF_JAVASCRIPT' and 'PDF_JS' heuristics. Specifically, the 'CVE_2007_5659' heuristic indicates the exploitation of a known vulnerability (Collab.collectEmailInfo) to execute a JavaScript stager. This stager is responsible for downloading and executing a secondary payload, as suggested by the 'annotation_subject_callee_hex_stager' heuristic and the presence of deobfuscated JavaScript. The ClamAV detection further confirms its malicious nature.

Heuristics 6

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-36182 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-36182
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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0007_000.js` `41610c1d21fd4fe29880b2ff28d535accf831823e31fcd3e19f55fc7a8531cde`	pdf-javascript-stream	PDF /JS object 7 at offset 0x1A6	612 bytes
`annotation_subject_callee_hex_stage_000.js` `55b7cf2cb9d32a6cd93df055aab28d087bc581cd1ac9435a447022ee0776b053`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x14F	5192 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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