PDF malware analysis — malicious · fe7ad01303217a5a

MALICIOUS

PDF

80.9 KB

MD5: 75ed5b7e20f41d1de38f49936d9560d0 SHA-1: 00dbabbd06aae3146107efd152e236b7fc4ffe95 SHA-256: fe7ad01303217a5a2a09339a1351cd4cfebfc0128fdd0fcbd613423612078e5d

244 Risk Score

Malware Insights

MITRE ATT&CK

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

This PDF file exhibits multiple high-confidence indicators of malicious JavaScript execution, including PDF_JAVASCRIPT, PDF_JS, and PDF_XFA heuristics. The ML classifier also flagged it with high confidence. The presence of a generic recovered JavaScript exploit stage suggests the PDF is designed to download and execute a second-stage payload. Due to scan completion issues, the full extent of the JavaScript's functionality could not be determined.

Machine Learning

Nyx PDF Classifier malicious score 0.9998

Heuristics 9

PDF JavaScript exploit cluster critical PDF_JS_EXPLOIT_CLUSTER

PDF combines an executable JavaScript/action surface with exploit staging indicators such as eval/unescape/fromCharCode, XFA script content, or a related CVE pattern. Benign form JavaScript remains low-severity, but this correlated cluster is high-confidence malicious behavior.
Correlated malicious PDF JavaScript signals critical PDF_CORRELATED_MALICIOUS_JS

PDF JavaScript or auto-action content is corroborated by exploit staging, ML, or suspicious extracted-artifact findings. This correlation promotes old exploit-kit PDFs that otherwise remain in the suspicious band because each individual signal is intentionally weighted conservatively.
Generic recovered JavaScript exploit stage high PDF_GENERIC_STAGE_RECOVERY

Bounded static stage recovery exposed hidden JavaScript through generic transforms such as null-byte collapse, percent decoding, marker replacement, arithmetic character codes, fromCharCode, numeric arrays, numeric-array minus-key decoders, alphabet-index arrays, /Producer half-difference metadata arrays, hex literals, marker-stripped Base64 literals, custom 6-bit XOR table decoders, or repeated-marker hex carriers. This rule is emitted only when the recovered stage contains exploit-like Acrobat JavaScript or shellcode markers.
ASCIIHexDecode filter (with exploit indicators) medium PDF_FILTER_HEX

Hex-encoding filter present alongside exploit delivery indicators — often used to hide payload or shellcode bytes
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.
XFA form low PDF_XFA

PDF uses XML Forms Architecture — can contain script logic
String.fromCharCode low PDF_FROMCHARCODE

String.fromCharCode found — used to construct payload strings dynamically. Common in benign JavaScript libraries for codepoint manipulation, so this alone is informational; weaponised use is also caught by the dedicated fromCharCode-stage and exploit-shape rules.
Scan did not complete info SCAN_INCOMPLETE

PDF JavaScript deobfuscation worker failed (worker exit 1); obfuscated JavaScript was not fully inspected.

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0002_000.js` `00d83f0df12dd0145d49c2412a9ed675e811ac74df112e5d8f8ec75f6ce39fa6`	pdf-javascript-stream	PDF /JS object 2 at offset 0x12F75	4690 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).
`acroform_b64_00.js` `2dcc302789541914f37753c067c2c4ea2237a5b048127e1f3f24d5698bb1be31`	deobfuscated-js	PDF AcroForm base64 (raw) at offset 0x13379	2803 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).
`deobfuscated.js` `b8740f6b38d0cea7ec0c5b4895f1a1f10a83dd44f5c93c1926b03064473d36a4`	deobfuscated-js	PDF JavaScript deobfuscation pass	399369 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s). Carved artifact contains 6 long base64-like blob(s).

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