PDF malware analysis — malicious · f57d31dedecc1d4b

MALICIOUS

PDF

11.7 KB

MD5: 8721312fb601c055af6107600be13aa9 SHA-1: 590fabf6cd930316fe92d98769caa4f19ccb6a89 SHA-256: f57d31dedecc1d4b0c1eecf2a4f814a83e7c2c0fc6d2ed73e6e8d10e7de8b288

178 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1204.002 Malicious File

The PDF file contains embedded JavaScript, triggered by the 'Collab.collectEmailInfo' function, which is a known method for exploiting CVE-2007-5659. The heuristic 'PDF_ANNOT_SUBJECT_CALLEE_HEX_STAGER' indicates that the JavaScript is hex-encoded and acts as a stager. This stager is responsible for decoding and executing a secondary payload, as confirmed by the ClamAV detection 'Pdf.Exploit.Agent-36179'. The document body is unreadable, but the exploit and stager functionality are clear.

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` `a3e4f45656b3bb1cecde2a7f2d9027fdb76e86d231344668a2ae6b6cd0e57d6f`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x14F	5279 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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