PDF malware analysis — malicious · 7505dfaefdd5827c

MALICIOUS

PDF

807.7 KB

MD5: 68dfce5020f56538c71d31040232b39e SHA-1: e63639addb170400b2767cca282a4e74d488614f SHA-256: 7505dfaefdd5827c2154972a66b4444b49a694b1e782c2eaaffae2ab82ada437

130 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF contains embedded JavaScript, indicated by multiple heuristics and the presence of a JavaScript file artifact. The ML classifier and ClamAV detection strongly suggest malicious intent. The JavaScript appears to be attempting to exploit vulnerabilities, as evidenced by the 'sprayWindows' function and the use of unescape with shellcode-like patterns, likely to download and execute a second-stage payload.

Machine Learning

Nyx PDF Classifier malicious score 0.9997

Heuristics 6

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.
JBIG2Decode filter medium PDF_JBIG2

JBIG2 image decoder present — historically used in zero-click exploits
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.
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.
PDF paints image(s) but contains no text operators info PDF_IMAGE_ONLY_LURE

PDF has 1 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 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0002_000.js` `1a2157cf1e3bd20aee964a87ebcd3fb83959c2d6ed1d397b1368e481d89b8c87`	pdf-javascript-stream	PDF /JS object 2 at offset 0x9C	42618 bytes
Detection ClamAV: Html.Exploit.IFrameBOF-1 Obfuscation or payload: likely Carved artifact contains 18 eval/decoder/string-building token(s).

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