PDF malware analysis — malicious · 1a38f8eb9ba95988

MALICIOUS

PDF

43.8 KB

MD5: ed321f203c7a298df632fa35c9d03723 SHA-1: 9579bd29efa86ec3dc802fb1f7b321620da895c3 SHA-256: 1a38f8eb9ba959883ad3473d2c110ee84b6c8bb9f729c87dcc1320b2863fa16d

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF contains embedded JavaScript and 3D content, indicated by multiple heuristic firings including 'PDF_JAVASCRIPT', 'PDF_JS', and 'PDF_U3D_CVE_RELATED'. The ML classifier strongly flags this PDF as malicious. Extracted artifacts include several JavaScript files and a U3D binary, suggesting a multi-stage attack. The primary intent appears to be the execution of malicious JavaScript, likely to download and execute a second-stage payload.

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` `73f343eb91a5b4686acef15c5aa2a5e8db9d34f7424c1687a7fcff8f546d728d`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x1D18	12611 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` `0f58919c4f254775f638265185e8456e57bbfe155f336d2ef44ea55ecbee4d55`	deobfuscated-js	PDF JavaScript deobfuscation pass	294130 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).
`u3d_00_off000042d6.bin` `fb27c6f6ffe2b08a88f79f344ef3cb4f85460ac81a062194b6fd84ab6e48b628`	pdf-3d-stream	PDF U3D 3D stream at offset 0x42D6	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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