PDF malware analysis — malicious · d1ae70b6c0727710

MALICIOUS

PDF

9.6 KB

MD5: fe26bd0a021c342d1fd201526f27f7fe SHA-1: 70fbbb24f60323b9a4fcf4753b56d2c947e99ded SHA-256: d1ae70b6c0727710239f213a4a0245ff094413fb2aa81ee6281606d863e2326d

186 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF document contains embedded JavaScript, specifically leveraging the 'Collab.collectEmailInfo' method to exploit CVE-2007-5659. This JavaScript acts as a stager, decoding and executing further malicious code. The ClamAV detection 'Pdf.Dropper.Agent-7307166-0' confirms its malicious nature as a dropper. The primary attack vector is the exploitation of a known PDF vulnerability to initiate a download and execution chain.

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-7307166-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-7307166-0
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` `9f17df95bc71874fe0f2dcb9f0e8f529cdb3604910d27079f2fbde52cabda2a8`	pdf-javascript-stream	PDF /JS object 7 at offset 0x19B	256 bytes
`annotation_subject_callee_hex_stage_000.js` `9e6cd667baec6dd25a55421ab4db6e4657ea5e73771ef35808254fa29ebf3ecd`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x14A	5198 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` `9da40a8022a64741171d5c01f9c13e52994b937c45d68f2be4d4ff1d41018ca1`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2D0	12291 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` `93c185ca43915566241402c160758ba6371c0ec6e8b0bec14522bb71292c8f68`	deobfuscated-js	PDF JavaScript deobfuscation pass	46819 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).

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