PDF malware analysis — malicious · f2ca52547be4a5fb

MALICIOUS

PDF

7.3 KB Created: 2008-31-20 53:85:00 Authoring application: Scribus 1.3.3.12 (via Scribus PDF Library 1.3.3.12)

MD5: 1e9d1dbc6e2aae3f14299a7dee50888a SHA-1: 8f1b85744a043b346baf9e508dc4abd9efc44670 SHA-256: f2ca52547be4a5fb1968be29122b5bd51a512273db1d101d0caa8fcab1d2e8f1

208 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF contains embedded JavaScript, flagged by multiple heuristics including PDF_JAVASCRIPT and PDF_JS. The critical ClamAV detection (Pdf.Exploit.Agent-35587) and ML classifier output strongly indicate malicious intent. The JavaScript stream, named 'javascript_obj0013_001.js', likely contains obfuscated code that attempts to exploit a vulnerability within the PDF reader, as suggested by the PDF_EVAL heuristic. The reconstructed string 'Math.ceil(LE0lwqXMhdq2Z/eDmKh6' and 'Math.min(LE0lwqXMhdq2Z,eDmKh6' within the script suggest complex calculations possibly related to payload deobfuscation or exploit staging.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 6

ClamAV: Pdf.Exploit.Agent-35587 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-35587
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.
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution
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.
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_obj0013_001.js` `b152d36369c29e60bbffa1d1f2d90c1b20ba2decef988e604ec552e808737567`	pdf-javascript-stream	PDF /JS object 13 at offset 0x38A	5923 bytes
Detection ClamAV: Pdf.Exploit.Agent-35587 Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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