PDF malware analysis — malicious · 4ef5208d64eb79f9

MALICIOUS

PDF

11.5 KB

MD5: f1c09b4609107c848a70365352273374 SHA-1: 06bbedc20f54f597250f07f00d0e032626c08161 SHA-256: 4ef5208d64eb79f9e42394e273e30985be211efd015a6683926196015b23886c

186 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF file contains embedded JavaScript, specifically leveraging the CVE-2007-5659 vulnerability via the `collab.collectEmailInfo` method. This JavaScript acts as a stager, indicated by the heuristic `PDF_ANNOT_SUBJECT_CALLEE_HEX_STAGER` and the presence of deobfuscated JavaScript files. The stager is designed to download and execute a secondary payload, although the exact download URL is not directly recoverable from the provided evidence. The ClamAV detection `Pdf.Exploit.Agent-36063` further confirms its malicious nature.

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.Exploit.Agent-36063 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-36063
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` `eb39e2de4dbbc100de6d3e30aa43ff78fa075618862ba1ebba5151ea3a3b848d`	pdf-javascript-stream	PDF /JS object 7 at offset 0x19D	273 bytes
`annotation_subject_callee_hex_stage_000.js` `06c721d5a134e9fabf971e5bd1808f8d0d874da21c28ac81da2d521f565866cc`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x14A	4886 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` `a503c6a75a557af19797a50e64644d565f6119cccf77bde7bb7ab6aae7ef2e95`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2D6	11746 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` `19885805eeaa3d374835777759f7f7c34170bc114178b2e2bec00c8e8a92055b`	deobfuscated-js	PDF JavaScript deobfuscation pass	75427 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).

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