PDF malware analysis — malicious · 80b7a1d38d834c9e

MALICIOUS

PDF

693.3 KB

MD5: 57311b91fc64c974e03dc3e054ee13ea SHA-1: 1637b1c827c6ab73dfc44031add6391b59b95515 SHA-256: 80b7a1d38d834c9e728a597fb49b953cd65bc82d834a6a54b473640c812cda6c

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, which is designed to exploit vulnerabilities. The embedded JavaScript likely attempts to download and execute a secondary payload, as indicated by the ClamAV detection of 'Html.Exploit.IFrameBOF-1' on an extracted artifact. The ML classifier strongly suggests malicious intent.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

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` `6008a4890f822b2cb1c97f5f3c48beb44bd73eb99bcc1f96a2cd8bbec15a272f`	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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