PDF malware analysis — malicious · 5599d40508172790

MALICIOUS

PDF

32.4 KB Created: 2010-01-17 10:46:55 +03:00 Authoring application: overMore (via ba00c3e6292cc2a52a34e7b373a4a9eb)

MD5: db2301a6503679c12998c70d33ce101b SHA-1: a3af787480b94f6fa6c645463c8b645c30b0c10b SHA-256: 5599d4050817279023d9d01a5110540875fe85d50798616f33e232f4397ca91e

164 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1566.002 Spearphishing Attachment T1204.002 Malicious File

The PDF file was flagged by ML classifiers and ClamAV as malicious (Pdf.Dropper.Agent-7013081-0). Static analysis revealed embedded JavaScript with eval() calls and ASCII85Decode filters, indicating obfuscated code execution. The presence of JavaScript actions and embedded JS streams strongly suggests the script is designed to download and execute a secondary payload, a common technique for PDF-based malware delivery.

Machine Learning

Nyx PDF Classifier malicious score 0.9969

Heuristics 7

ClamAV: Pdf.Dropper.Agent-7013081-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-7013081-0
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
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.
ASCII85Decode filter (with exploit indicators) low PDF_FILTER_85

ASCII85 encoding filter present alongside exploit delivery indicators — uncommon outside of obfuscation
Optional Content Group with action trigger low PDF_OPTIONAL_CONTENT

Optional Content Group (layer) co-occurs with an action trigger — content can be selectively hidden from viewers or scanners while the action still fires on open
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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0014_000.js` `c6bc70932c0ffe193a404d5631467e6db1eb226f653562d3fcc78b9a8c4220fe`	pdf-javascript-stream	PDF /JS object 14 at offset 0x191E	37163 bytes
`javascript_obj0016_001.js` `12ac428aa4b040fbcdf2181c6af597336dd261610260a4839b51bcd3f86df4a7`	pdf-javascript-stream	PDF /JS object 16 at offset 0x764D	1756 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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