PDF malware analysis — malicious · 61b7d9e28c104e93

MALICIOUS

PDF

2.6 KB

MD5: 7e73d01794a509980977539ca8e48708 SHA-1: b3be2ec5edb0ebf64405f8ea32e5eef3743c1b38 SHA-256: 61b7d9e28c104e9308c3cd7ff45a78c23ef18ed31f9083f9c45c2b2d0563413b

154 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript that is executed upon opening. The script uses app.eval() to execute a string obtained from an annotation's subject, which is then deobfuscated and evaluated. This technique is commonly used to download and execute further malicious content.

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` `3309dae6f97881b78f203aef24f7faaf18de3f5c1a518ca22d14c99af0e5a01e`	deobfuscated-js	PDF JavaScript deobfuscation pass	7397 bytes

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