PDF malware analysis — malicious · 4a4726f61941b673

MALICIOUS

PDF

3.6 KB First seen: 2017-03-15

MD5: a3ee90337f5517fa051d756a0ca0d5e7 SHA-1: 81ea8cf7e04c189b90406b70a72d8e366231a15b SHA-256: 4a4726f61941b67360bb1f8c67e547694a6e20bdca1bca7586dcb80e9beae728

116 Risk Score

Malware Insights

MITRE ATT&CK

T1559.002 Component Object Model Hijacking T1559 Component Object Model Hijacking

The PDF contains embedded JavaScript and an embedded file named 'PO38229287.doc'. The ML classifier strongly indicates maliciousness. The embedded file and JavaScript suggest an attempt to deliver a secondary payload, likely an OLE object, to the user.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 5

JavaScript action low 2 related findings PDF_JAVASCRIPT

PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
exportDataObject + nLaunch — embedded-file launch-on-open dropper critical PDF_JS_EXPORT_LAUNCH_DROPPER

PDF JavaScript calls exportDataObject() with nLaunch set, which extracts the document's embedded file and launches it in its default application. This is a launch-on-open dropper: the embedded file is the payload. No benign workflow auto-launches an extracted PDF attachment.
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.
Embedded file low PDF_EMBEDDED

PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload
Suspicious extracted artifact info 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.

Extracted artifacts 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`PO38229287.doc`	pdf-embedded-file	PDF EmbeddedFile object 8 at offset 0x3B6	8345 bytes
SHA-256: `1c69cdc2f7329284120166eb00e6b3256439a9483512c3c1691bcf2a29ac3d01`
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).
`javascript_obj0009_000.js`	pdf-javascript-stream	PDF /JS object 9 at offset 0xCAA	63 bytes
SHA-256: `2e197fa1ce6df63607dd177a39e03313710e005608ed3dd33abe0f4a2ef48ae7`
Preview script First 1,000 lines of the extracted script this.exportDataObject({ cName: "PO38229287.doc", nLaunch: 2 });
`javascript_obj0009_001.js`	pdf-javascript-stream	PDF /JS object 9 at offset 0xCAA	61 bytes
SHA-256: `68ba048f26b38f756fe9aaa8d75d19f96623b764735d4fedcc0ce07b3323856c`
Preview script First 1,000 lines of the extracted script this.exportDataObject({ cName: "PO38229287.doc", nLaunch: 2 }
`combined_document_js_000.js`	deobfuscated-js	combined document JavaScript streams at offset 0xCAA	125 bytes
SHA-256: `3d48c2b651f7af9669a8255e73e6c432eea7f4faa5664b013e476822b4c3df92`
Preview script First 1,000 lines of the extracted script this.exportDataObject({ cName: "PO38229287.doc", nLaunch: 2 }); this.exportDataObject({ cName: "PO38229287.doc", nLaunch: 2 }

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