PDF malware analysis — malicious · 442b002c6f340bcf

MALICIOUS

PDF

12.2 KB

MD5: bb42430da4bc4d9c68df432040e683af SHA-1: 3e8e6e1af2ce0bbb5b8391115fd7e91bc097131e SHA-256: 442b002c6f340bcff781062d9e71f831805c26cc84a622e4261315c9e861916e

178 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including 'PDF_JAVASCRIPT' and 'PDF_JS'. A critical heuristic, 'CVE_2007_5659', specifically identifies the use of Collab.collectEmailInfo to exploit a vulnerability, likely for the purpose of executing a stager. The recovered JavaScript is heavily obfuscated, but the exploit itself is the primary indicator of malicious intent. The ClamAV detection further supports the malicious classification.

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-36165 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-36165
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` `3f254d15363cfc46f758dc79a2cb1074c4072b68aa3f4c80a9bf6696d85176e0`	pdf-javascript-stream	PDF /JS object 7 at offset 0x1A6	1045 bytes
`annotation_subject_callee_hex_stage_000.js` `900a1c3dd846815c262ef48b93285c928ae641cd698384080da247a0bab48112`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x14F	5251 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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