PDF malware analysis — malicious · e864c07696c03fdd

MALICIOUS

PDF

30.3 KB Created: 2009-05-01 21:21:45 Authoring application: ghjkSFghjkCPx (via afdsdgf)

MD5: a5039129fedee56933e7dc424fea88ae SHA-1: b1b150a40f9cee7b6bce4f4f2fba622ffa994f42 SHA-256: e864c07696c03fdd3d0a8964cace970ee0808e06d9dbd602a31a73a01b651c49

208 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript T1204.002 Malicious File

The PDF file contains embedded JavaScript streams, with high-confidence heuristics indicating the use of eval() and ML classifiers flagging it as malicious. ClamAV detection as 'Pdf.Exploit.Agent-35587' further confirms malicious intent. The embedded JavaScript likely attempts to download and execute a second-stage payload, as suggested by the 'tp.s' string which appears to be a partially reconstructed URL or command. The ML_NYX_PDF_MALICIOUS score of 0.999993 indicates a very high probability of maliciousness.

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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0007_000.js` `1bde3eb03036750e945f6e0aea18ca5d0444536bbd79ddcc35ec115a00ece25a`	pdf-javascript-stream	PDF /JS object 7 at offset 0x21C	29798 bytes
Detection ClamAV: Pdf.Exploit.Agent-35587 Obfuscation or payload: likely Carved artifact contains 6 eval/decoder/string-building token(s).
`javascript_obj0007_001.js` `e880fff1afd35eb4e603e682f8833e52bebf7720444fb62618d0250f8c2c4244`	pdf-javascript-stream	PDF /JS object 7 at offset 0x21C	28746 bytes

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