PDF malware analysis — malicious · 72d01d4f98545efd

MALICIOUS

PDF

807.3 KB

MD5: 28f4098a158ef5a14517d751a851c754 SHA-1: 065f81a63a53c0b9b7bb10cdc436b32999866bed SHA-256: 72d01d4f98545efde9f85232d76bcaec3180846eb58aff26f02280124f1f8688

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 including ML classification and ClamAV detection on an extracted artifact. The JavaScript appears to be designed to exploit a vulnerability and download a second-stage payload, as indicated by the 'Js.Exploit.Shellcode-18' ClamAV signature. The presence of obfuscated JavaScript and the ML classifier's high confidence suggest a malicious intent to execute arbitrary code.

Machine Learning

Nyx PDF Classifier malicious score 0.9998

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).

Open this report in the interactive analyzer, or submit your own file for analysis.