PDF malware analysis — malicious · 18cc63d4e86a4970

MALICIOUS

PDF

4.0 KB

MD5: 808836593b4e514150f56fc1ce9f201e SHA-1: d816096f0a1f6e1cc92683dd0f852f0979a1574f SHA-256: 18cc63d4e86a4970fd657362e3bf1513baeb1d7e0677aabd7864ec11c6cb7679

154 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains embedded JavaScript that is designed to be evaluated. This JavaScript leverages the `app.eval` function and calls `syncAnnotScan` to execute further obfuscated code. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to download and execute a second-stage payload.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

Heuristics 5

ClamAV: Pdf.Exploit.Agent-36063 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-36063
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.
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)

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0007_000.js` `eb39e2de4dbbc100de6d3e30aa43ff78fa075618862ba1ebba5151ea3a3b848d`	pdf-javascript-stream	PDF /JS object 7 at offset 0x1D2	273 bytes
`generic_stage_recovery_000.js` `41323bb0bc5d6e8e4f59ad32a6e5f405b8b479252ecf9b61a0159542b2003e8e`	deobfuscated-js	generic stage recovery split-literal-normalize from JavaScript object 7 at offset 0x1D2	263 bytes
`deobfuscated.js` `d434946c43e8af38a328d292063917f36605715b8fda4fe1cb91f6222562ed1c`	deobfuscated-js	PDF JavaScript deobfuscation pass	12948 bytes

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