PDF malware analysis — malicious · 3bfc6a1004abe124

MALICIOUS

PDF

196.3 KB First seen: 2022-06-24

MD5: fad4b10723180b2c8b210b7c5e4e4ccd SHA-1: f13fda96e4f45e7259503417b46e77630eed5c7d SHA-256: 3bfc6a1004abe124b7a688e56376f9c8ec51cfa2a669954ae8ac627548e17aa2

88 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF contains JavaScript that is configured to launch an embedded object. This object, identified as 'embedded_file_obj0037.bin', is likely a secondary payload. The presence of PDF_JS_EXPORT_LAUNCH_DROPPER heuristic confirms this dropper functionality. The document body was unreadable, but the heuristics strongly indicate a malicious intent to download and execute a further stage.

Machine Learning

Nyx PDF Classifier suspicious score 0.4712

Heuristics 6

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 file low PDF_EMBEDDED

PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload
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)
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_obj0037.bin` `ddf95cdac5c95c55036575e4592022fe115e95f5f9436b27c1f813e5f227a1b3`	pdf-embedded-file	PDF EmbeddedFile object 37 at offset 0x2A9D8	38584 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.55, consistent with packed or encrypted content.
`stream_022_off00030d1f.bin` `bdc993baece80f9d3268559421d957b51465a5cb0bcf1dff97e730a78644c7fd`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x30D1F	1248 bytes

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