PDF malware analysis — malicious · 92ee9e52b56b5871

MALICIOUS

PDF

3.5 KB Created: 2009-04-14 19:57:50 Authoring application: Scribus 1.3.3.12 (via Scribus PDF Library 1.3.3.12)

MD5: 9c7eda946482400e5f6f23ddcab7bdc0 SHA-1: 0c2df181a455fdc22c169cdce3c737591f9d8a77 SHA-256: 92ee9e52b56b58716cfa329ba3f74513e503c134cc3f5eeae6ec880052f43dc8

216 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

This PDF file was flagged as malicious by ClamAV with the signature Pdf.Exploit.Agent-35835. Static analysis revealed embedded JavaScript with eval() calls and String.fromCharCode usage, indicating obfuscated code execution. The ML classifier also strongly indicated maliciousness. The primary intent appears to be exploiting PDF vulnerabilities to run arbitrary JavaScript, likely to download and execute a second-stage payload.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

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` `12ae34a0aefaf6935aba03262b62b2263b423c8a22a7bfa55277359e8d990945`	pdf-javascript-stream	PDF /JS object 13 at offset 0x3CE	7126 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` `92c973f6cbd963c9be8d7f162795f713a148908d2e750e476751b18fe9c4d57f`	deobfuscated-js	PDF JavaScript deobfuscation pass	16131 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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