PDF malware analysis — malicious · bf966d5955184ba5

MALICIOUS

PDF

51.3 KB Authoring application: 3.0.6 (5.0.11)

MD5: c852b584dfda969c0225887c58affbc8 SHA-1: 6d57264a6b55f7769141a6e2f3ce9b1614d76090 SHA-256: bf966d5955184ba5ed1b253726ab350af30d6af30c7a65e846f734cd34268881

128 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1566.002 Spearphishing Attachment

The PDF file contains embedded JavaScript, identified by heuristics like PDF_JAVASCRIPT and PDF_JS. This script, extracted as 'stream_002_off0000c7f0.js', is flagged as a suspicious payload. The ML classifier strongly indicates maliciousness. The script's likely intent is to download and execute a second-stage payload from the external URI 'https://bo0klng.blogspot.com', a common technique for phishing or malware distribution.

Machine Learning

Nyx PDF Classifier malicious score 0.9732

Heuristics 6

Embedded script payload in PDF stream high PDF_EMBEDDED_SCRIPT_PAYLOAD

PDF stream bytes contain script execution markers such as ActiveXObject/CreateObject, WScript.Shell, PowerShell, or shell-exec primitives. This is stronger than ordinary PDF JavaScript because it indicates a staged external script payload hidden in stream bytes.
Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE

PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 51 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
Suspicious extracted artifact medium 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.
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. (matched inside decoded stream)
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. (matched inside decoded stream)
External URI info PDF_URI

PDF contains an external URL action

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`stream_002_off0000c7f0.js` `405817043a223809a56c2dbc2e1b508c3a746b218b3c5dd589170d6137823347`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0xC7F0	2010 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 shell/COM execution token(s).

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