PDF malware analysis — malicious · 24d5533858d4bc49

MALICIOUS

PDF

3.5 KB Created: 2009-04-30 22:27:21 Authoring application: Scribus 1.3.3.12 (via Scribus PDF Library 1.3.3.12)

MD5: 5014454e395b13b720e6d9d649fe2dbb SHA-1: ac4f9c7f0869d2254a64e6eeb6460cdfd563a608 SHA-256: 24d5533858d4bc4978986651fa5ff506c74e9cad99641ff1ed65b871f5320caa

186 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 Command and Scripting Interpreter: PowerShell T1204.002 Malicious File: Malicious File

The PDF file contains embedded JavaScript, including calls to eval() and String.fromCharCode, indicating an attempt to obfuscate and execute malicious code. The ClamAV detection of 'Pdf.Exploit.Agent-35835' strongly suggests it's a known exploit. The extracted JavaScript files likely contain the payload, which is designed to exploit vulnerabilities within the PDF reader.

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_000.js` `a1ff9ae4756b306ca7e62c5af9597f5d92566a5470d846b5e7bc86e603c15754`	pdf-javascript-stream	PDF /JS object 13 at offset 0x3CE	7169 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` `60190b3cbab2849e2c14db26f659b4a81f7a1deed4947d36570b218fdcb2cb4f`	deobfuscated-js	PDF JavaScript deobfuscation pass	15914 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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