PDF malware analysis — malicious · c43a948c6cb504f7

MALICIOUS

PDF

12.0 KB

MD5: fc7ad6580acf40f17b0bc69a3f8c42e3 SHA-1: 2f3513ce44094deaaf8cb71ac0313871c0008e87 SHA-256: c43a948c6cb504f7be4b83ad5f1bf44cfc4070ba1c4a2d324d326a0b3fa6442e

186 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link T1204.002 Malicious File

The PDF file contains a critical heuristic firing for CVE-2007-5659, indicating exploitation of a vulnerability related to `Collab.collectEmailInfo`. This exploit leverages a JavaScript stager embedded within an annotation subject, which is then decoded and executed. The presence of multiple deobfuscated JavaScript files suggests a multi-stage payload delivery. The primary attack vector is the exploitation of the PDF reader to download and execute a secondary malicious payload.

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` `71a01731ccad36735406aa2d36c7f83397f4a112683cba3019ea035518a3b148`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x14A	5095 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` `6f1438e4bc649c025674298f18e87bba8e2d7e925f492302cae420dbba08bbd7`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2D6	12270 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` `70055703488c4e3fbef320af46d77f76748f39da43a85dd958f2e2e507450f02`	deobfuscated-js	PDF JavaScript deobfuscation pass	71094 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).

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