PDF malware analysis — malicious · bc8d6b6d4254dd24

MALICIOUS

PDF

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

MD5: 527de472d74f805e497eb26e942d34c0 SHA-1: 7c9b6fe3dae176d9e4c025ce156fe9f4ad73a2d6 SHA-256: bc8d6b6d4254dd2472f90ba37550530449c59466523d6aa4494d68ea3f47759f

186 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL. The presence of 'eval()' and 'String.fromCharCode' suggests obfuscated code execution. ClamAV detection as 'Pdf.Exploit.Agent-35835' confirms its malicious nature. The extracted JavaScript artifacts, particularly 'deobfuscated.js', likely contain the logic for downloading and executing a secondary payload, which is a common attack pattern for such documents.

Heuristics 7

ClamAV: Pdf.Exploit.Agent-35835 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-35835
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 (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. (matched inside decoded stream)
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_obj0013_001.js` `7f05ffedc4a0a0c93daad152ad47bde4505bd2afaef6d12cb6ebc99cd5c9cc6f`	pdf-javascript-stream	PDF /JS object 13 at offset 0x3D7	5909 bytes
Detection ClamAV: Pdf.Exploit.Agent-35835 Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`deobfuscated.js` `82e98d7a24db097b54456c068f7e0622910682c1ca173ea6d715662594e397cf`	deobfuscated-js	PDF JavaScript deobfuscation pass	13763 bytes
Detection ClamAV: Pdf.Exploit.Agent-35835 Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s). Carved artifact contains 2 long base64-like blob(s).

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