PDF malware analysis — malicious · 05d8bc12d167cf6d

MALICIOUS

PDF

61.1 KB

MD5: 18a1d5f50d6726cd73a27ac113f22866 SHA-1: 84fb28b36973c34d49c7ee17a0823127ce707121 SHA-256: 05d8bc12d167cf6d1f56bfa8060b10f92c5688f960a2a34e2983be4739e60808

238 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 secondary payload. ClamAV detections on both the primary PDF and the extracted artifact confirm its malicious nature as a downloader. The ML classifier also strongly indicates maliciousness.

Machine Learning

Nyx PDF Classifier malicious score 0.9674

Heuristics 8

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)
ClamAV: Xls.Downloader.94c25b356b5a6cac-9978798-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Xls.Downloader.94c25b356b5a6cac-9978798-0
ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV

ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`embedded_file_obj0022.bin` `f8c9f6f02af548c5e80d20e69b19a37b8a9a77c1bde0e61f7e3cd325ff457958`	pdf-embedded-file	PDF EmbeddedFile object 22 at offset 0x193A	50376 bytes
Detection ClamAV: Xls.Downloader.94c25b356b5a6cac-9978798-0 Obfuscation or payload: likely Carved artifact entropy is 7.83, consistent with packed or encrypted content.
`stream_005_off0000ccf3.bin` `273270994f8bc3540df1f98f87ea5a0fedd04a2faf7266093c380d47ee63e846`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0xCCF3	33120 bytes
`stream_006_off0000f0c0.bin` `217a403c9c6bccc0b4ef4bf2be13325302990d946fe53bc4aa8c6136b4315ace`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0xF0C0	929 bytes

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