PDF malware analysis — malicious · 0d15d697b4101e4b

MALICIOUS

PDF

74.0 KB Created: 2010-03-15 01:18:42 Authoring application: QyvTpQgvUJ (via ER8kT7ysKcFvA)

MD5: 442c8a43f3a770b2ddd8272f5b7a74ed SHA-1: 37a8a090897432f9081543c692ba050732fc0806 SHA-256: 0d15d697b4101e4b1afd991de91039a9118a7f202a4d9dd3edfb0c694dd066cf

216 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 that utilizes `eval()` and `fromCharCode()` functions, indicating an attempt to obfuscate malicious code. This JavaScript is highly likely to be an exploit designed to download and execute a secondary payload, as suggested by the 'PDF JavaScript exploit cluster' heuristic and ClamAV detection. The ML classifier also strongly flags this PDF as malicious.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

Heuristics 7

PDF JavaScript exploit cluster critical PDF_JS_EXPLOIT_CLUSTER

PDF combines an executable JavaScript/action surface with exploit staging indicators such as eval/unescape/fromCharCode, XFA script content, or a related CVE pattern. Benign form JavaScript remains low-severity, but this correlated cluster is high-confidence malicious behavior.
ClamAV: Pdf.Exploit.Agent-15728 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-15728
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.
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.
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` `0388488808eff0991c088956acbbd13e54caa5ceb9a8ac1c71eda7d784c4306b`	pdf-javascript-stream	PDF /JS object 7 at offset 0x23D	74532 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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