PDF malware analysis — malicious · c50eac9a69c12213

MALICIOUS

PDF

39.9 KB

MD5: cf24c75d29ab4f25ddc6736fa2cf5890 SHA-1: 16401e29263f7d31ce1e412727fc3b2d4043c121 SHA-256: c50eac9a69c12213c1023d690063f71f5a55a7150d8e613b361bf0f2ddb04d66

226 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File T1059.001 PowerShell T1059.007 JavaScript

The PDF file contains embedded JavaScript that is obfuscated and designed to act as a stager. The critical heuristic CVE_2007_5659 indicates the use of the 'collab.collectEmailInfo' function, a known method for exploiting vulnerabilities in older Adobe Reader versions to execute arbitrary code. The embedded JavaScript is likely responsible for downloading and executing a secondary payload, as suggested by the presence of multiple deobfuscated JavaScript files and a U3D exploit indicator. The ClamAV detection further confirms the malicious nature of the file.

Heuristics 8

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)
U3D/3D content in PDF — Adobe Reader 3D parser CVE-family indicator high CVE related PDF_U3D_CVE_RELATED

PDF contains U3D (Universal 3D) or 3D annotation content — CVE-2011-2462 and CVE-2009-3953 are critical vulnerabilities in Adobe Reader's U3D processing that allow arbitrary code execution. U3D content in PDFs is extremely rare in normal documents.
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 5

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 0x1A4	273 bytes
`annotation_subject_callee_hex_stage_000.js` `74bfd28095b59c9421389eba87f148803f7ad78ebed7586516309ba27f3f083a`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x151	5545 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` `c24fce6a2821c6f6b4f41efd3c7ebafa151a3d20cec273d693f4f3b20e4e756f`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2DD	13107 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` `b3cbf8d77e5c803dafcc491a70bad4b78cd10fb77e4809d3d6a3b06aceaf9b08`	deobfuscated-js	PDF JavaScript deobfuscation pass	276651 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).
`u3d_00_off00003329.bin` `db166b7bf539ceb527a321927dc7262838bbe91b146a4aa26884d46ee5696f20`	pdf-3d-stream	PDF U3D 3D stream at offset 0x3329	27443 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.99, consistent with packed or encrypted content.

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