PDF malware analysis — malicious · 0cec5dd12fba9091

MALICIOUS

PDF

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

MD5: d611aada1c1b0d766a31aea5654e6e63 SHA-1: cc9051ecb80dd3d12dbdf663fe666c528aa64703 SHA-256: 0cec5dd12fba9091dc4d5330e5dc7cb0ad2044e850aa98e3901cc554af2e69ee

268 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript that utilizes eval() calls, a common technique for obfuscation and execution of malicious code. The presence of PDF_JS_EXPLOIT_CLUSTER and ClamAV detections strongly indicates exploitation of a PDF vulnerability to run this script. The script's primary function is to download and execute a secondary payload, as suggested by the heuristic EXTRACTED_FILE_STATIC_TRIAGE and the nature of exploit clusters.

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-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` `b7c4d23775457c2c66c978ba949604886a4ba325d5156a1c40eeb6f0d740e001`	pdf-javascript-stream	PDF /JS object 7 at offset 0x21C	30337 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` `d5c610c39095d470195c50f93e73e974f6b0fc041a9b561190bb20bbf87b2956`	pdf-javascript-stream	PDF /JS object 7 at offset 0x21C	29349 bytes

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