PDF malware analysis — malicious · 937de5396265fc86

MALICIOUS

PDF

39.7 KB

MD5: e4d37f8d6add9f23cf354a7d8b7f1d50 SHA-1: 5b47c747b8ae658561a3786e401f2ee5b672076b SHA-256: 937de5396265fc86e013446c0042ec2d38ad5072b15c1c94580ef3cb2c02fbd3

226 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File T1059.001 PowerShell

This PDF file is malicious, as indicated by ClamAV and multiple high-severity heuristics related to exploitability. Specifically, the 'CVE_2007_5659' heuristic points to the use of the 'collab.collectEmailInfo' function within embedded JavaScript, a known method for exploiting Adobe Reader vulnerabilities. The embedded JavaScript, particularly the 'annotation_subject_callee_hex_stage_000.js' and 'legacy_pdfkit_stage_001.js' files, is responsible for executing the exploit. The presence of U3D content also suggests an attempt to leverage 3D rendering capabilities for exploitation.

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` `4225e560f4153cb0b55b49a3c9d7cd5c5952e38532d787df108cb2a4b04a433a`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x151	5461 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` `357ffe39e0d3d550895e18bd4e8572f58b0e434e19ab71c697c27032159efbf0`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2DD	12971 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` `75fd3905b535a604a735b69aa4ca9743b3b692281f174019536489bf1e3d509c`	deobfuscated-js	PDF JavaScript deobfuscation pass	275344 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).
`u3d_00_off00003279.bin` `db166b7bf539ceb527a321927dc7262838bbe91b146a4aa26884d46ee5696f20`	pdf-3d-stream	PDF U3D 3D stream at offset 0x3279	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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