Malicious PDF — malware analysis report

Static analysis result for SHA-256 513c8c0f85a9858d…

MALICIOUS

PDF

380.0 KB Created: +ñ;rÚÊìUcþ°þŽàÎé»Ûæ§çÀ­zç9ÿö}Þ-,!ÝúV¶E㢲c=øÑ k²½o7ØÃ6½7¯õ*@Ë폌0r. Authoring application: +ñ;rÚÊìUcþ°þŽàÎ醭l:jòº0õÂNÕþu !Ó¸ë8·eãM‘ó
MD5: 8fa706c7930c740c2dd62e57c52561d5 SHA-1: e818059c007cb49059e1dcadba6946f8620866de SHA-256: 513c8c0f85a9858d539acbb6892a10bfc897169fd0565645348f9c5daa7f1902
66 Risk Score

Malware Insights

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

The PDF file contains embedded JavaScript, which is used to obfuscate and hide the actual malicious content. The 'PDF_ENCRYPTED_WITH_JS' heuristic indicates that the payload is hidden from static analysis, suggesting a downloader or dropper functionality. The presence of JavaScript actions and streams points to an attempt to execute code upon opening the document. The document body is largely unreadable, further supporting the idea that the content is meant to be hidden.

Heuristics 5

  • Encrypted PDF carries /JS — payload hidden from static analysis high PDF_ENCRYPTED_WITH_JS
    PDF declares /Encrypt and also references an executable trigger (/JS). 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.
  • AcroForm button with action trigger low PDF_ACROFORM_BUTTON
    PDF contains a /Btn form field together with a SubmitForm/URI/Launch/JS trigger — this is the building block of fake 'Download' or 'Open' button overlays used in PDF phishing lures
  • PDF paints image(s) but contains no text operators info PDF_IMAGE_ONLY_LURE
    PDF has 2 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.

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0263_000.js
7e2a2457b8d216e9b8b09e8ce272dee45af5d206e079775ce0ce1a1d88ee2d21		 pdf-javascript-stream PDF /JS object 263 at offset 0x5C524 176 bytes
javascript_obj0259_001.js
68d9cf778b7a35c78fc470d7a4d39935d1951fced3a5b86322abaa53dfad5122		 pdf-javascript-stream PDF /JS object 259 at offset 0x5C6F1 64 bytes
javascript_obj0257_002.js
9cd7da8a5e336123524c23869ce96abe876eb6291633bded109c76364ed9e642		 pdf-javascript-stream PDF /JS object 257 at offset 0x5C842 64 bytes
javascript_obj0255_003.js
b7b6e7563f15367d33d63c9b4e99aa5657445d391a12f6833eb4473b08ebca98		 pdf-javascript-stream PDF /JS object 255 at offset 0x5C997 48 bytes

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