PDF malware analysis — malicious · e74ad5521bc72f4d

MALICIOUS

PDF

12.3 KB

MD5: 8d1d55ece4d96b5ab02a995581a85509 SHA-1: b645668350b804626048a31981d095b7cb2d1c95 SHA-256: e74ad5521bc72f4df0fa326c5ff75261c81693634b384664f0e262ec7d92d9a3

178 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1204.002 Malicious File: User Execution: Malicious Script

The PDF file contains embedded JavaScript, identified by the 'PDF_JAVASCRIPT' and 'PDF_JS' heuristics. A critical heuristic, 'CVE_2007_5659', indicates the exploitation of a vulnerability related to the 'Collab.collectEmailInfo' function within PDF annotations. This function is used to decode and execute a hex-encoded JavaScript stager, which is likely responsible for downloading and executing a second-stage payload. The 'annotation_subject_callee_hex_stager' heuristic further confirms the presence of this obfuscated JavaScript.

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-36179 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-36179
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` `e89d7054d228dd0d7d4de9a02d1607a443ba297f326673115b5825c1b6cb184a`	pdf-javascript-stream	PDF /JS object 7 at offset 0x1A6	823 bytes
`annotation_subject_callee_hex_stage_000.js` `affa48b583210a370de44f32150883f1342a933f9850fde4c20ffd87cfe26585`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x14F	5332 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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