PDF malware analysis — malicious · 37022f878752fed6

MALICIOUS

PDF

807.7 KB

MD5: cb57fe22dd515e0bd4262841480c620d SHA-1: a832023e3c6ad4664b2c0b4f1e07616f8ca007f0 SHA-256: 37022f878752fed66d8612a0d25d51257d05fd453862c915b8db65c2a93274cb

130 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF contains embedded JavaScript, flagged by multiple heuristics, which is responsible for downloading and executing a secondary payload. ClamAV detected this payload as 'Html.Exploit.IFrameBOF-1'. The ML classifier also strongly indicated maliciousness. The document body was not analyzed for content.

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` `b4ece4bb282d3db8d1c112dbcb89a2399b84b9545823d8acb41abb2f8a6d5ca4`	pdf-javascript-stream	PDF /JS object 2 at offset 0x9C	42640 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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