PDF malware analysis — malicious · 07e114caefadcb97

MALICIOUS

PDF

194.6 KB First seen: 2022-05-19

MD5: 987915c295b6bd2a3fe081c9772d92d0 SHA-1: 714a76d3eb12d8b85ccccfa96c71fccb6f1052a7 SHA-256: 07e114caefadcb974a8d2016456efa0a57cc31b0285d09f728740609364833e6

118 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript that is configured to launch an embedded file, acting as a dropper for a second-stage payload. The ML classifier also flagged this PDF as malicious. The presence of the embedded file and the JavaScript action strongly indicate a malicious intent to execute further code.

Machine Learning

Nyx PDF Classifier malicious score 0.8351

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_obj0028.bin` `65bc7a091c0bd3cd12db9d17f62efb37e79f1479f185eb32b53d91fec0f843b2`	pdf-embedded-file	PDF EmbeddedFile object 28 at offset 0x1A0A0	95744 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.92, consistent with packed or encrypted content.
`stream_014_off00030672.bin` `0ce9956a639bc58c221ef1320c096caf4b18ef62e5fd69e39cec113f1d904009`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x30672	1111 bytes

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