PDF malware analysis — malicious · 3dafb5b937b2dd42

MALICIOUS

PDF

29.1 KB Authoring application: PyPDF2

MD5: c352025d7ed1e97c49862f8eed834126 SHA-1: 724b752c844357189ae77d3e7c7c05908faf639e SHA-256: 3dafb5b937b2dd42fd62d3328dc0cd2d6b51dcf3c10dbd7419b76514d2feb6ea

288 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1566.002 Spearphishing Attachment

This PDF file contains embedded JavaScript that is heavily obfuscated, indicating an attempt to hide malicious activity. The heuristics indicate a PDF JavaScript exploit cluster and generic stage recovery, suggesting the script is designed to download and execute a second-stage payload. The presence of JBIG2 decoding with active content further points to a malicious PDF designed to exploit vulnerabilities.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

Heuristics 10

JBIG2 + active content high CVE related PDF_JBIG2_ACTIVE_CONTENT

JBIG2Decode appears with JavaScript/XFA/RichMedia — a related indicator for JBIG2 parser-exploit families including CVE-2021-30860 and CVE-2009-0658, but not a unique CVE fingerprint.
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.
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution
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.
JBIG2Decode filter medium PDF_JBIG2

JBIG2 image decoder present — historically used in zero-click exploits
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
Suspicious extracted artifact medium 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.
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.
PDF paints image(s) but contains no text operators info PDF_IMAGE_ONLY_LURE

PDF has 2 image XObject(s) and the content stream contains no text-emitting operators (BT/ET, Tj, TJ, ', ") in either raw bytes or decompressed streams — this is the screenshot-as-PDF pattern used to bypass text-based scanners and to deliver instructions purely through rendered pixels. It is informational unless paired with invisible links or risky URI context.

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0005_000.js` `5460aabd24acc5cb09837d84ad372cd526b1b04414f42520d8cfcc7de46e5a68`	pdf-javascript-stream	PDF /JS object 5 at offset 0x67F	7001 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 shell/COM execution token(s). Carved artifact contains 3 eval/decoder/string-building token(s).
`generic_stage_recovery_000.js` `2e1b3fa62af0c824d696939a4386b3d87305e41a43e0f68fe08d6f3662ac6ac8`	deobfuscated-js	generic stage recovery split-literal-normalize from decompressed stream at 0x0 at offset 0x0	29836 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 shell/COM execution token(s). Carved artifact contains 3 eval/decoder/string-building token(s).

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