PDF malware analysis — malicious · f2e3efaa279a86bf

MALICIOUS

PDF

1.34 MB First seen: 2026-05-13

MD5: d79c7d4f6a038753bbc681176ec83c42 SHA-1: a84faef73080e5bb8a28f8c4f8ac9a58cea5f6be SHA-256: f2e3efaa279a86bfb2f89d3a1ee98188fa87794c9ae26e405446a6480cbe713e

88 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.001 PowerShell T1140 Deobfuscate or Obfuscate Malicious Code

The PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The PDF_IMAGE_ONLY_LURE heuristic suggests the document is designed to look like a normal document but lacks actual text content, implying a deceptive purpose. The embedded JavaScript likely attempts to download and execute a second-stage payload, as evidenced by the embedded file artifact. The obfuscated nature of the PDF content and the embedded JavaScript points towards an attempt to hide malicious activity.

Machine Learning

Nyx PDF Classifier suspicious score 0.2664

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.

Filename	Kind	Source	Size
`embedded_file_obj0031.bin`	pdf-embedded-file	PDF EmbeddedFile object 31 at offset 0x99667	900608 bytes
SHA-256: `d66ccdc801af4fefb8e588a21b22c1480d8d1c67d84a392a1f077caa9401e0a4`
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.77, consistent with packed or encrypted content.
`stream_014_off00156346.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x156346	1067 bytes
SHA-256: `e7ab540560c88a05251fd11d1315d65e8f53e6321c61e070aaab52308e45ce3e`

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