PDF malware analysis — malicious · 2892f9e63ca207a5

MALICIOUS

PDF

7.2 KB Created: 2008-31-20 53:85:00 Authoring application: Scribus 1.3.3.12 (via Scribus PDF Library 1.3.3.12)

MD5: 8f5b7cf5970cd9e89b686e6fe959f33d SHA-1: 03fa8a0947bff9822ee07bdd059b65b3f1b08d3f SHA-256: 2892f9e63ca207a5df7dc28b25507d29c2b7152a7a4fa23133a13c81cc545de9

178 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

The file is a PDF containing embedded JavaScript, indicated by multiple heuristic firings including 'PDF_JAVASCRIPT', 'PDF_JS', and 'PDF_EVAL'. The critical 'CLAMAV_DETECTION' heuristic identifies the file as 'Pdf.Exploit.Agent-35587'. The embedded JavaScript uses 'eval()' and string concatenation to construct and execute code, a common technique for obfuscating malicious payloads. The reconstructed string 'Math.ceil(lnDIU/SfceTmRdp0Z5' and 'Math.min(lnDIU,SfceTmRdp0Z5' suggest complex calculations within the script, likely to decode or prepare a payload. The primary intent appears to be the execution of a second-stage exploit or malware.

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 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0013_001.js` `2ad2db01e1a4cf093d4ec7ca84beb5bb3a515e7855750a84d5a89322b066087f`	pdf-javascript-stream	PDF /JS object 13 at offset 0x3D6	5727 bytes
Detection ClamAV: Pdf.Exploit.Agent-35587 Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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