PDF malware analysis — malicious · 73b1af3456facb40

MALICIOUS

PDF

807.3 KB

MD5: 017e2b716d21be50682a33062b674360 SHA-1: 5c0af8a852b15693a144788fbba65f3f2c403fae SHA-256: 73b1af3456facb409b51b5fa1372468ee7527133e6a6c991fea9fa5d2ee3e271

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, flagged by multiple heuristics, and ClamAV detected a JavaScript exploit shellcode. The ML classifier also strongly indicated maliciousness. The JavaScript appears to be designed to exploit viewer vulnerabilities and download additional content, likely a second-stage payload.

Machine Learning

Nyx PDF Classifier malicious score 0.9970

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` `b0fe81c26ef4bdc0097b46274e00d6c30238017a8a78861a606163edaa1caf24`	pdf-javascript-stream	PDF /JS object 2 at offset 0x9E	41173 bytes
Detection ClamAV: Js.Exploit.Shellcode-18 Obfuscation or payload: likely Carved artifact contains 11 eval/decoder/string-building token(s).

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