PDF malware analysis — malicious · 39e4743ab278ba8a

MALICIOUS

PDF

4.0 KB

MD5: 5b4488e0711e9eca9d7d7fda20375f4e SHA-1: 0ead06f7e52cf24f0f3adcf75322f575c3659e49 SHA-256: 39e4743ab278ba8a2da5e81671f3d6ab963f6f9a44803c9ab5527bfbe2209f2f

126 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file 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. The ClamAV detection 'Pdf.Exploit.Agent-18300' strongly suggests an exploit is present. The extracted JavaScript files 'acroform_b64_00.js' and 'javascript_obj0013_001.js' are likely involved in the exploit delivery mechanism, although their specific actions could not be fully determined due to potential obfuscation.

Heuristics 6

ClamAV: Pdf.Exploit.Agent-18300 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-18300
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` `72691e9d5ea5a311eec9b9e5782443833c09e09a7a5fa492e53b794a1522ac88`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6337 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`acroform_b64_00.js` `8bf77aa3182a752c0f7c69467c1b7fd5d420fe366589bd416c889320f3b4199f`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3600 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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