PDF malware analysis — malicious · 73d584345330e722

MALICIOUS

PDF

2.72 MB

MD5: 993117b5bc719a1095063f7abfac4d42 SHA-1: 350a87802bfb04a06e50a1bf323d5891ee3f4573 SHA-256: 73d584345330e7222a5172cf23d14a55792de8f977931e8c9d497cf318f113b3

198 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF contains embedded JavaScript that utilizes the `exportDataObject` and `nLaunch` functions, indicating an intent to drop and automatically launch an embedded file. The embedded artifact is named 'nnn.doc', which is also referenced in the document body and the deobfuscated JavaScript. This dropper functionality is a common technique for delivering secondary payloads.

Machine Learning

Nyx PDF Classifier malicious score 0.9994

Heuristics 8

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.
ClamAV: Pdf.Dropper.Agent-7640984-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-7640984-0
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
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.
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.
Embedded URL info EMBEDDED_URL

One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.

URL http://schemas.microsoft.com/office/word/2003/wordml

Extracted artifacts 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`nnn.doc` `953f99c26fb635c3295f78c6809ba3897050fa205f274d6af30d16ba6f97259c`	pdf-embedded-file	PDF EmbeddedFile object 8 at offset 0x56B	949756 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 80 long base64-like blob(s).
`javascript_obj0009_000.js` `28b4127ea8fa5e65232b0d0108def5281a3204354def709a00744297b2a88f37`	pdf-javascript-stream	PDF /JS object 9 at offset 0x2B8092	56 bytes
`javascript_obj0009_001.js` `963ed45f988dbd45078acd836821e4c07e4ff29a40c2bbac3ba51e198c3b45e8`	pdf-javascript-stream	PDF /JS object 9 at offset 0x2B8092	54 bytes
`combined_document_js_000.js` `75533713bc3c8f7156c75ac8c0807743561d0576be27ef326ea5936169827022`	deobfuscated-js	combined document JavaScript streams at offset 0x2B8092	111 bytes

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