Malicious PDF — malware analysis report

Static analysis result for SHA-256 de005688586d8a7d…

MALICIOUS

PDF

19.8 KB Created: ƒÆZóU õÖÜ^hvlؙc;°ÀT° Authoring application: 9h”eCňìX+]E (via 9hŒeAńìX]QêÈHböôð—<ÜE=]š>T0؂Iÿ)
MD5: 9bd088d24e5f56dd88a0bcb08a6e0320 SHA-1: e2a82d88269978f8e02e6478fd3c193a64bf4093 SHA-256: de005688586d8a7d634db360b5e25c8a7872261b0819aae05f473ef2c1ed1b28
86 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1566.001 Spearphishing Attachment T1027 Obfuscated Files or Information

This PDF file was flagged as malicious by an ML classifier and contains embedded JavaScript. The JavaScript action and embedded JS stream indicate that the document is designed to execute code. The PDF is also encrypted and uses an OpenAction, which is a common technique to hide malicious payloads from static analysis. The embedded JavaScript is likely responsible for downloading and executing a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • Encrypted PDF carries /OpenAction — payload hidden from static analysis high PDF_ENCRYPTED_WITH_JS
    PDF declares /Encrypt and also references an executable trigger (/OpenAction). Document encryption hides the JavaScript body and stream contents from static scanners — combined with auto-execution indicators this is a known evasion pattern used to deliver weaponised JavaScript that the analyst cannot inspect without the decryption key.
  • 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.

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0012_000.js
0d4bfa7d3a4cadf75bd216473a9f6959ba5137e232ac8698bfa526c4a050ed97		 pdf-javascript-stream PDF /JS object 12 at offset 0x35F0 5152 bytes

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