PDF malware analysis — malicious · 3c1f1e730e418c26

MALICIOUS

PDF

11.3 KB

MD5: a88bb65d9c2ef238cc0b8d12934f8df6 SHA-1: 80610d7d55d0abfae32b8f4a153f0bfaab77c0f4 SHA-256: 3c1f1e730e418c26fb488ce2b73c6ef2119aa9bb3c1cb3152d643a639850dce1

178 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link T1204.002 Malicious File

The PDF file contains embedded JavaScript that is obfuscated and likely acts as a stager. The critical heuristic 'CVE_2007_5659: Collab.collectEmailInfo' indicates exploitation of a known vulnerability in Adobe Reader. The deobfuscated JavaScript is substantial, suggesting it performs complex actions, such as downloading and executing further malicious content. The presence of ClamAV detection further supports 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-36180 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-36180
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` `17e11d5c0e7abf0d400044cf4333a75f193b35e2745d65fea155eb4de3ce3aa6`	pdf-javascript-stream	PDF /JS object 7 at offset 0x1A6	628 bytes
`annotation_subject_callee_hex_stage_000.js` `1fdb7377490cd617c0d3bf9cab07298f55ed5f17456781d658ce1bcef50814c4`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x14F	4996 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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