PDF malware analysis — malicious · 60638f2294d60b1d

MALICIOUS

PDF

8.0 KB

MD5: f632fc34721a537432e88ee5dd1f1e98 SHA-1: 8a9423e6ad9a55602212c177dac3a2ddc3570eaf SHA-256: 60638f2294d60b1d59c7cedefb408aa5f856cca918901a5555220d93945e0dfd

154 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript that is designed to be executed upon opening. The script leverages the `app.doc.syncAnnotScan()` and `app.eval()` functions to deobfuscate and execute arbitrary code. This is a common technique for exploiting PDF vulnerabilities to deliver further malicious payloads.

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` `8b5fc84d6a590f06ade6f9c7c5ea4ea48df13b7a29f330cd6dbb3915f7aeeee2`	deobfuscated-js	PDF JavaScript deobfuscation pass	29308 bytes

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