PDF malware analysis — malicious · 0645a8590c6b7de0

MALICIOUS

PDF

17.6 KB Created: 2010-03-13 01:18:46 Authoring application: wmoRgR9 (via K08ur8k)

MD5: d9a5472259c1a3b32e4f76df8e0592c2 SHA-1: 1404231d246f0b97d2bf9e9214b3edc6ac944ad0 SHA-256: 0645a8590c6b7de0c1aaa95dbd989341d2cea72d1e85d00368a6fc1705151f42

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 flagged as an exploit cluster and is highly likely to download and execute a secondary payload, as suggested by the ClamAV detection signature 'Pdf.Exploit.Agent-15271'. The ML classifier also strongly indicates maliciousness.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

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-15271 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-15271
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` `9a23f872f74213b3e182e8f8433cfb47206627e9bd27316868e6c64fc71fda48`	pdf-javascript-stream	PDF /JS object 7 at offset 0x240	16820 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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