PDF malware analysis — malicious · 87ed1185459743f8

MALICIOUS

PDF

9.6 KB

MD5: 11f62354d265d093d6952f1f1b1dabbb SHA-1: fc61caca2c52933527efe1ea29135d1d69a78c94 SHA-256: 87ed1185459743f8ad515bb59847c56678d926bda339aec76143ce02e078b7bf

186 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

The PDF file contains embedded JavaScript that leverages the 'Collab.collectEmailInfo' method to exploit CVE-2007-5659. This technique is used to decode and execute a hex-encoded stager. The ClamAV detection name 'Pdf.Dropper.Agent-7279548-0' further confirms its malicious nature as a dropper. The primary attack pattern involves exploiting a known PDF vulnerability to initiate a multi-stage download and execution process.

Heuristics 7

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.Dropper.Agent-7279548-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-7279548-0
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.
syncAnnotScan annotation-staging primitive low PDF_FOXIT_SYNCANNOTSCAN

PDF JavaScript calls syncAnnotScan() — a no-op annotation-enumeration primitive used by exploit-kit JavaScript to stage payload reads from annotation /Subject fields before eval(). Not a vulnerable sink itself; rarely seen in legitimate PDFs. (matched in decompressed stream)
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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0007_000.js` `11b03694c4e705ab29873cc5e2c55342ee498b376ac2dc5f05ce17018ef44c38`	pdf-javascript-stream	PDF /JS object 7 at offset 0x19D	264 bytes
`annotation_subject_callee_hex_stage_000.js` `a942cdce3c40a6f785754861e71d825ba1042fc1b896035eab71b92fafececd5`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x14A	5290 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_001.js` `9d62a81da12cb4c8dff259c17043f89142411113c3920db276a82668c4898c46`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2CC	12338 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`deobfuscated.js` `8a8b309a789fba0aacb60585dadbf5e0e97408b78f787c2727261d9f8b85a0d2`	deobfuscated-js	PDF JavaScript deobfuscation pass	78503 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).

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