PDF malware analysis — malicious · 6cb377081cbc06fc

MALICIOUS

PDF

808.7 KB

MD5: b9c550c30d523b4ff92c3688d0f32ec2 SHA-1: fa86608f6fe5c87d52d869244e5e19872601d305 SHA-256: 6cb377081cbc06fcde905eee4fdb7e4a6931f6b3a0f9d1a5fa1c3a6934f886f4

130 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF file contains embedded JavaScript, flagged by multiple heuristics including ML classification and ClamAV detection. The JavaScript code appears to be an exploit attempting to spray memory, a common technique for preparing to execute shellcode. This strongly suggests the PDF is designed to deliver a malicious payload, likely downloaded from a remote source, aligning with spearphishing attachment tactics.

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` `e0f39abdf1b39cbf994a41747f48d8d2bb62d4bc791a80ceea7c660fe0017eb0`	pdf-javascript-stream	PDF /JS object 2 at offset 0x9E	41545 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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