PDF malware analysis — malicious · d1c2cc0ca653df8d

MALICIOUS

PDF

243.1 KB First seen: 2022-06-19

MD5: 578684aff04e625a2d6801a2fbedc005 SHA-1: 98fdacf3212d4116bb9b7141cd7008414b082078 SHA-256: d1c2cc0ca653df8ddb46c1337a5972eaceb81ea924e8ebdb7af0699a7ab909fd

118 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File T1566.002 Spearphishing Attachment

The PDF contains JavaScript that is configured to launch an embedded object, identified by the 'PDF_JS_EXPORT_LAUNCH_DROPPER' heuristic. This indicates the PDF is designed to act as a dropper for a secondary payload. The embedded file 'embedded_file_obj0037.bin' is the likely payload. The ML classifier also flagged this PDF as malicious.

Machine Learning

Nyx PDF Classifier malicious score 0.6300

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` `25672487eb5df23ce72e6ea101ef4047c1407cb0dcb25e59486f125763a9f69d`	pdf-embedded-file	PDF EmbeddedFile object 37 at offset 0x303F0	53760 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.84, consistent with packed or encrypted content.
`stream_022_off0003c873.bin` `2a28783c6daf99299280577b755302b72b4198f20447ec91839f1e42a08a1def`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x3C873	1248 bytes

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