Malicious PDF — malware analysis report

Static analysis result for SHA-256 77c62147b9c4e97b…

MALICIOUS

PDF

44.1 KB
MD5: ebc00897b6a4cdcd027ba2a6e8bbfe13 SHA-1: 814f5ab78aab644d2ff63d717e4dcad9753d476f SHA-256: 77c62147b9c4e97b403d81a9544ebbe6c9c633ad1497659a4d1f8e4db76ac2b0
266 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

This PDF document contains JavaScript that utilizes the exportDataObject and nLaunch functions to automatically launch an embedded file named 'msf.pdf'. This is a common technique for dropper malware to execute a secondary payload upon opening the document. The ML classifier and critical heuristics strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 10

  • Embedded PDF child has suspicious static findings critical PDF_EMBEDDED_CHILD_STATIC_TRIAGE
    PDF contains an embedded PDF stream whose extracted child matches suspicious or malicious PDF heuristics. Wrapper PDFs are commonly used to hide the actual exploit or lure payload from scanners that do not recursively inspect attachments.
  • PDF JavaScript exploit cluster critical PDF_JS_EXPLOIT_CLUSTER
    PDF combines an executable JavaScript/action surface with exploit staging indicators such as eval/unescape/fromCharCode, XFA script content, or a related CVE pattern. Benign form JavaScript remains low-severity, but this correlated cluster is high-confidence malicious behavior.
  • 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.
  • 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
  • XFA form low PDF_XFA
    PDF uses XML Forms Architecture — can contain script logic
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://ns.adobe.com/xdp/
    • http://www.xfa.org/schema/xci/2.6/
    • http://www.xfa.org/schema/xfa-template/2.6/

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0012_000.js
9c89507e7f73dc5bd86ea08b3023329fd1f5d9467f1470e6419c7839b2db59ed		 pdf-javascript-stream PDF /JS object 12 at offset 0x9A39 3773 bytes
msf.pdf
ea4f7a889e5f963e197e473218bcbbeac6096156cbcecaaffe40a389c4e24594		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0x3A2 44482 bytes
javascript_obj0009_000.js
d34469e19a1a64397bfd3c97f146a8aca8c2e06509fc8ac323640cceb1b714e3		 pdf-javascript-stream PDF /JS object 9 at offset 0xAEED 56 bytes
javascript_obj0009_001.js
2bb1e7a202c327335e98a6e43785bbd246ca7796ccc763fad48de6300cba11eb		 pdf-javascript-stream PDF /JS object 9 at offset 0xAEED 54 bytes
combined_document_js_000.js
a47da90a90138a24714d337b7ec72a2c67f24d6864ef0304a209a65f364f6305		 deobfuscated-js combined document JavaScript streams at offset 0xAEED 111 bytes

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