PDF malware analysis — malicious · b93c228bb479e7b2

MALICIOUS

PDF

42.9 KB

MD5: e70c50cc003f672e30b90772b7a93d40 SHA-1: b010f8a763319da092962380e7063a0fe9f58690 SHA-256: b93c228bb479e7b27cd9f7928bf4f0d1f4fa17e241f4b872cb67ac07a244a670

96 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1204.002 Malicious File T1059.001 PowerShell

The PDF file contains embedded JavaScript and a U3D stream, which is flagged as a potential indicator for Adobe Reader 3D parser exploits. The ML classifier strongly indicates maliciousness. The embedded JavaScript, particularly the 'deobfuscated.js' artifact, likely downloads and executes a second-stage payload, contributing to the overall malicious intent of the document.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

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_obj0005_000.js` `13cad8154c205beb6306190be1155bbba6aa71c0daad170f29662965290d6f84`	pdf-javascript-stream	PDF /JS object 5 at offset 0x14F	475 bytes
`legacy_pdfkit_stage_000.js` `7bace6925eeba6b843f500d9181006d484388f282c871a6ca3815ded11cd2cb6`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x1BB1	11876 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` `9a2440ea57e16717150102637d421cbe8ae11f02949531b0eca1c2aa6c1f6811`	deobfuscated-js	PDF JavaScript deobfuscation pass	281172 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).
`u3d_00_off00003f69.bin` `fb27c6f6ffe2b08a88f79f344ef3cb4f85460ac81a062194b6fd84ab6e48b628`	pdf-3d-stream	PDF U3D 3D stream at offset 0x3F69	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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