Malicious PDF — malware analysis report

Static analysis result for SHA-256 75e132d2e9052d6d…

MALICIOUS

PDF

639.0 KB Created: A  bg÷Z(KîÎ 3Ï¢{zêdFÚû°·4(‹<þ–ñKWÕC(ßcƒ ì  ³8 Authoring application: ”°?ÝV_˜Ýk­þ.§Ë£h”<$oƘ-=}ŽN‡®y‡ G•"¤œ*š (via 5nD³Aõì?Oó¿¥Èѯ&/ZVœµŒ¼õýÚ³]¨«°Bëð;ÑzUf)
MD5: 7be70d428d4eedbce0124c73f3db3a18 SHA-1: d278f6966c732f8a372b58e13e4f96bf44c5abf4 SHA-256: 75e132d2e9052d6d9a656d55d8218d858feb87adb38db64a6f627143cbe05512
74 Risk Score

Malware Insights

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

This PDF file is identified as malicious due to the presence of embedded JavaScript, which is further obfuscated and encrypted. The 'PDF_ENCRYPTED_WITH_JS' heuristic indicates that the payload is hidden from static analysis, suggesting it's designed to download and execute a second-stage payload. The PDF structure itself appears to be a lure, as indicated by 'PDF_IMAGE_ONLY_LURE', with no readable text content, further supporting the malicious intent.

Heuristics 6

  • 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.
  • 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
  • PDF paints image(s) but contains no text operators info PDF_IMAGE_ONLY_LURE
    PDF has 1 image XObject(s) and the content stream contains no text-emitting operators (BT/ET, Tj, TJ, ', ") in either raw bytes or decompressed streams — this is the screenshot-as-PDF pattern used to bypass text-based scanners and to deliver instructions purely through rendered pixels. It is informational unless paired with invisible links or risky URI context.

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