PDF malware analysis — malicious · 1dacd403ec2c7555

MALICIOUS

PDF

15.0 KB Created: 2009-10-02 19:47:75 Authoring application: PDF Library 2.6.1 (via PDF Library 8.2.1)

MD5: 06c1e1f93626072aebbc6130e22b06fa SHA-1: ddfebac02205b53c2019c40b7f5a117ef6618247 SHA-256: 1dacd403ec2c7555509f782d7fdcfaf3d09e36477848ceaceeab4e6951d75a31

178 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File T1071.001 Web Protocols

This PDF sample was flagged as malicious by ClamAV and an ML classifier. It contains embedded JavaScript with eval() calls and String.fromCharCode, indicating obfuscation and potential exploit execution. The primary function appears to be downloading and executing a second-stage payload, as suggested by the 'Pdf.Dropper.Agent' detection name and the presence of an embedded JavaScript file.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 8

ClamAV: Pdf.Dropper.Agent-7236492-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-7236492-0
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
ASCIIHexDecode filter (with exploit indicators) medium PDF_FILTER_HEX

Hex-encoding filter present alongside exploit delivery indicators — often used to hide payload or shellcode bytes
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.
String.fromCharCode low PDF_FROMCHARCODE

String.fromCharCode found — used to construct payload strings dynamically. Common in benign JavaScript libraries for codepoint manipulation, so this alone is informational; weaponised use is also caught by the dedicated fromCharCode-stage and exploit-shape rules. (matched inside decoded stream)
PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED

The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PSSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
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_obj0007_000.js` `f44a2e6ae912fb8f9e51d62bee4df44adb2fc8265b0078a4261bf3da45da5577`	pdf-javascript-stream	PDF /JS object 7 at offset 0x268	112129 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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