Malicious PDF — malware analysis report

Static analysis result for SHA-256 42abac0dbf309204…

MALICIOUS

PDF

18.8 KB
MD5: 40f5194f42814d8a67ce4467f0f868ac SHA-1: 87793fb76aedceec7231a383ea386e660ce44532 SHA-256: 42abac0dbf309204293ce717e32a87fcc0a4fd850898e9a30f5fcd280e77e1bd
66 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

The PDF contains embedded JavaScript with multiple heuristic firings indicating malicious intent, including eval() calls and fromCharCode usage. The JavaScript is obfuscated, making its exact function difficult to determine, but it is likely designed to download and execute a second-stage payload. The PDF itself appears to be an image-only lure with no readable text content.

Heuristics 6

  • eval() call high PDF_EVAL
    eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
  • 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. (matched inside decoded stream)
  • 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. (matched inside decoded stream)
  • String.fromCharCode low PDF_FROMCHARCODE
    String.fromCharCode found — used to construct payload strings dynamically. Common in benign JavaScript libraries for codepoint manipulation, so this alone is informational; weaponised use is also caught by the dedicated fromCharCode-stage and exploit-shape rules. (matched inside decoded stream)
  • 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.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://ns.adobe.com/xap/1.0/
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/pdf/1.3/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000004ac.bin
4447bc3bf2370788a868beaf4e818cbde6061d04686c8a8695d700584551fe2b		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4AC 4794 bytes
objstm_0025_00.bin
8b4886c9285fc6b8261233f8d1dcf8084b962d540a69034e522cf4fef3a5ceff		 pdf-objstm-decoded PDF /ObjStm 25 0 obj (inflated) 428 bytes
objstm_0050_00.bin
e40602bf0719194f229f03154f5f43c9a7f181bc0d4ed370425edd2aaf768402		 pdf-objstm-decoded PDF /ObjStm 50 0 obj (inflated) 32 bytes

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