PDF malware analysis — malicious · ce86b30f2b4e67b2

MALICIOUS

PDF

88.7 KB

MD5: 822155adbf8dd4f0dc4c606e62e336fd SHA-1: 3a48037f3183eff27e4fc800186877c3e8d2ffee SHA-256: ce86b30f2b4e67b2aee45aac7de1a434b26044ac266a59dc7f280390063396d7

178 Risk Score

Malware Insights

MITRE ATT&CK

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, which identified it as 'Xls.Downloader.94c25b356b5a6cac-9978798-0'. The presence of embedded files and JavaScript actions indicates a likely attempt to deliver a secondary malicious payload. The document body was unreadable, but the heuristics strongly suggest a downloader functionality.

Machine Learning

Nyx PDF Classifier malicious score 0.8600

Heuristics 7

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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`embedded_file_obj0025.bin` `1155c0a3ed4fff855d7638989626d70a34a9cd35c943d5899fce5fa8fb2a47e2`	pdf-embedded-file	PDF EmbeddedFile object 25 at offset 0xA933	50552 bytes
Detection ClamAV: Xls.Downloader.94c25b356b5a6cac-9978798-0 Obfuscation or payload: likely Carved artifact entropy is 7.84, consistent with packed or encrypted content.
`stream_010_off00015eff.bin` `fd873aa6897477eafa98e857736dfccb04bb1d1e88ed4843c028c72a36f0972b`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x15EFF	1019 bytes

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