PDF malware analysis — malicious · e0bbdffdd4aa3d8c

MALICIOUS

PDF

11.9 KB

MD5: e87b7f99c1c1edfc66973de815129691 SHA-1: e51806f49c85e0651d861ca98df81de02c320a3c SHA-256: e0bbdffdd4aa3d8cf427b0b8474acab0471d10f218c1d9a36aa2181220bd20a2

186 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1204.002 Malicious File: User Execution: Malicious PDF

The PDF document contains embedded JavaScript that is obfuscated and executed via a CVE-2007-5659 exploit targeting the Collab.collectEmailInfo function. The primary mechanism involves a hex-encoded stager that decodes and evaluates a larger JavaScript payload. This payload is responsible for the malicious activity, likely downloading and executing a second-stage payload. The ClamAV detection of '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` `fc942c56467bd530fffd2ae6058e43f5fae47fee7a29967d806152d8489d9629`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x14A	5074 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` `6d8953484337249499926f5a6342a5a5e4e2a8e700b5b39bdec727e4c21fd689`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2D6	11991 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` `67dfee041ae56db18e150e90ae7218f7cc05730eb6dc5429a5ca9bc99f4483e4`	deobfuscated-js	PDF JavaScript deobfuscation pass	71862 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).

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