Malicious PDF — malware analysis report

Static analysis result for SHA-256 4644986431150b4e…

MALICIOUS

PDF

31.6 KB Created: §5Äҙƒ¿it(ë5z9!T×6 Authoring application: Ê·ãÛ8Џ>Ejßb;< (via ʤãÛ8ڏ;Ekßn;+c)
MD5: 82bf12b7a4964d46879bbddd02fe2bcd SHA-1: 8e5246f4e367105a904ed29f7ce8ba1c3d53c908 SHA-256: 4644986431150b4e767310bb04ae7c1a001e4a6b750618d5edc42d7de17e6e5c
64 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1566.001 Spearphishing Attachment

This PDF file is flagged as malicious due to the presence of JavaScript embedded within an encrypted object. The PDF_ENCRYPTED_WITH_JS heuristic indicates that the JavaScript is used to obscure the actual payload, preventing direct static analysis. The embedded JavaScript file, javascript_obj0009_000.js, is likely responsible for executing the malicious actions. The attack pattern is inferred to be phishing or credential harvesting due to the common use of such obfuscation techniques in these types of attacks.

Heuristics 4

  • Encrypted PDF carries /JavaScript — payload hidden from static analysis high PDF_ENCRYPTED_WITH_JS
    PDF declares /Encrypt and also references an executable trigger (/JavaScript). 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.
  • Optional Content Group with action trigger low PDF_OPTIONAL_CONTENT
    Optional Content Group (layer) co-occurs with an action trigger — content can be selectively hidden from viewers or scanners while the action still fires on open

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0009_000.js
0e8c0e772368b75277307fedc1c6fd21559b9b7b96133cb8aa27e320db77dafa		 pdf-javascript-stream PDF /JS object 9 at offset 0x3DE 29768 bytes

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