PDF malware analysis — malicious · f5f82e100476e16c

MALICIOUS

PDF

12.0 KB

MD5: 17e196d3a50a18ae57e4326982dc3144 SHA-1: 387d8aff834571c21b131dcdeb6e545a70a16773 SHA-256: f5f82e100476e16c49b573c9fd8b07aa3b1cce1de3e11c3d81c6bafd316be31b

178 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF sample contains embedded JavaScript, specifically identified as a stager using a hex decoder. This script is triggered by the CVE-2007-5659 vulnerability (Collab.collectEmailInfo). The primary function of the script appears to be downloading and executing a second-stage payload, as indicated by the 'stager' heuristic. The deobfuscated JavaScript file 'annotation_subject_callee_hex_stage_000.js' is the core component responsible for this malicious activity.

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` `ad94dad38f0fd5f68493a7a2ae71c0ea17001c677e5736217bb237a79f8910a9`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x14F	5146 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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