Malicious PDF — malware analysis report

Static analysis result for SHA-256 283dcfaf32f981fc…

MALICIOUS

PDF

1.06 MB First seen: 2026-05-13
MD5: fe737952f61840d653bc8f426b6ca664 SHA-1: b88dc4795027db93d739317cff2faa2cec19fc78 SHA-256: 283dcfaf32f981fc8a2285fc1399274cbd66ffa58683993ea979efe32534e5d3
88 Risk Score

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4078

Heuristics 6

  • JavaScript action low 2 related findings 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)
  • exportDataObject + nLaunch — embedded-file launch-on-open dropper critical PDF_JS_EXPORT_LAUNCH_DROPPER
    PDF JavaScript calls exportDataObject() with nLaunch set, which extracts the document's embedded file and launches it in its default application. This is a launch-on-open dropper: the embedded file is the payload. No benign workflow auto-launches an extracted PDF attachment. (matched in decompressed 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)
  • Embedded file low PDF_EMBEDDED
    PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload
  • 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.
  • Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_file_obj0034.bin pdf-embedded-file PDF EmbeddedFile object 34 at offset 0xFA78D 90296 bytes
SHA-256: b9ef6c37433f5d0e4fcdb77104d79b6b4a9149bcaf0dc4f9ee334e2d60d91a4b
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact entropy is 7.92, consistent with packed or encrypted content.
stream_016_off0010f7e7.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x10F7E7 1089 bytes
SHA-256: 6d9260411310c527dacde546845a3ab5453cebef988739e48506785fd2557cd6