Malicious PDF / .PHP — malware analysis report

Static analysis result for SHA-256 71da0932286325d0…

MALICIOUS

PDF / .PHP

32.7 KB Created: ÔñþS_NW׳ ¯d{ÿbòºªTG Authoring application: 7Ã}Ïof‚Kš=I¾ (via 7ÃnÏofŠ‚Jš1I©I°)
MD5: 55bedd174d734393ddbcfbb1d94facf5 SHA-1: 852e49306a42c46e9b15005cb6153dd4894173ff SHA-256: 71da0932286325d0f1ce77a9d3c18d92cf9b9512b356b6e51e8b5b1de8fbfb14
94 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment T1027 Obfuscated Files or Information

This PDF file contains embedded JavaScript, which is heavily obfuscated and likely intended to download and execute a second-stage payload. The PDF is also encrypted, further concealing the malicious content. The ML classifier strongly indicates maliciousness, supporting the conclusion that this is a downloader or dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0008_000.js
820216f976200e446a2c1df017c5eb59f1b1a7a75ebc836d9737051e29b35273		 pdf-javascript-stream PDF /JS object 8 at offset 0x4EE 2047 bytes
javascript_obj0009_000.js
5a350f9355ead5150de736464c81d332b5061976133da4ab7e36af5b1e565b82		 pdf-javascript-stream PDF /JS object 9 at offset 0x3D5 30862 bytes

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