PDF malware analysis — malicious · 1dfa15c8c7b00f93

MALICIOUS

PDF

539.4 KB First seen: 2022-06-10

MD5: b6a380f3e92b2554bd4f8e36b826bdef SHA-1: c3111540bd503274fff36d34c10df68732b1962e SHA-256: 1dfa15c8c7b00f93c4c2a52b7a403fda61dca06d6669d941d6fa831ac206af95

118 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF contains JavaScript that is configured to launch an embedded file upon opening, as indicated by the 'PDF_JS_EXPORT_LAUNCH_DROPPER' heuristic. This embedded file, named 'embedded_file_obj0037.bin', is likely a secondary payload. The ML classifier also flagged this PDF as malicious. No document body text was available for analysis, but the presence of JavaScript and an embedded file strongly suggests a dropper functionality.

Machine Learning

Nyx PDF Classifier malicious score 0.5550

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` `4ea4a078015948904897ecd2f0d6abc1017ac21ef4de7a05b8493fa58e86a2f3`	pdf-embedded-file	PDF EmbeddedFile object 37 at offset 0x2823F	388520 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.99, consistent with packed or encrypted content.
`stream_024_off00086951.bin` `5e3c2e8d69aba76e3bcd636666c3f796cd378cc41324717319c3ba7a75ba5e17`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x86951	1320 bytes

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