PDF malware analysis — malicious · 00acc40d866b0aaf

MALICIOUS

PDF

3.5 KB Created: 2009-04-20 02:11:59 Authoring application: Scribus 1.3.3.12 (via Scribus PDF Library 1.3.3.12)

MD5: 6bf91736c7b4cc5d19144e7e8d1d165e SHA-1: d377d6a168e7c20a28d0502c2d3d064722ad7aae SHA-256: 00acc40d866b0aafe8f55f1870cb3e1dc5514fec21f9db25a5109e149f628827

276 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript T1204.002 Malicious File T1566.002 Spearphishing Attachment

The PDF file contains embedded JavaScript that utilizes `eval()` and `String.fromCharCode()` for obfuscation, a common technique for exploiting PDF vulnerabilities. The critical heuristic `PDF_JS_EXPLOIT_CLUSTER` and ClamAV detections (`Pdf.Exploit.Agent-1869`, `Pdf.Exploit.Agent-35835`) strongly indicate malicious intent. The deobfuscated JavaScript likely serves as a downloader for a secondary payload.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 8

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-1869 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-1869
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` `6ee10d2c274b8823f7990739d11a15ba711f7eb09225ed2cb2b8f61cb9091890`	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` `4a865803c3639c9364253e7fbc219558a54b6864bfa3a6c75e59a6ad969906fb`	deobfuscated-js	PDF JavaScript deobfuscation pass	16791 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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