PDF malware analysis — malicious · 596bf01ef94c539f

MALICIOUS

PDF

44.5 KB

MD5: b99904fcb78dc7c591a295e92626be67 SHA-1: d70905909ab42ae0dce17156bd531befbbbe3c62 SHA-256: 596bf01ef94c539f674902b842bd4f233bf524af6b0a13714e3f47f889d19f05

66 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File: User Execution: Malicious File T1059.001 Command and Scripting Interpreter: JavaScript

The PDF file contains embedded JavaScript and U3D content, with heuristics indicating a CVE-related exploit targeting Adobe Reader's 3D parser. The embedded JavaScript streams, particularly 'legacy_pdfkit_stage_000.js' and 'deobfuscated.js', are likely responsible for executing the malicious payload. The presence of U3D content further supports the exploitation vector. The exact nature of the payload is not discernible from the provided evidence, but the overall pattern suggests a drive-by download or exploit delivery mechanism.

Heuristics 5

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.
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_obj0009_000.js` `ba1f02105cf22032ecdc21dd278e1ea30325053c4839b3aedd4af0ed02dc9dc7`	pdf-javascript-stream	PDF /JS object 9 at offset 0x438D	450 bytes
`legacy_pdfkit_stage_000.js` `8ae45e4d56f7f1e796c560be6dd15cbbd91653b382e499cda7542faa9e721bf4`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x1BBC	12329 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`deobfuscated.js` `18410dfbff14886f05054e97c87f06b61cf1af58d66c3b77b15230c4f904b5d9`	deobfuscated-js	PDF JavaScript deobfuscation pass	225878 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 long base64-like blob(s).
`u3d_00_off000045cb.bin` `fb27c6f6ffe2b08a88f79f344ef3cb4f85460ac81a062194b6fd84ab6e48b628`	pdf-3d-stream	PDF U3D 3D stream at offset 0x45CB	28021 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.79, consistent with packed or encrypted content.

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