PDF malware analysis — malicious · 43f63341a3bdf07a

MALICIOUS

PDF

4.0 KB

MD5: 8f9f3f14dba3e8d1d2fc5a47aad95be8 SHA-1: e8762d1f60d06cd77bea742093bf7338d7d27825 SHA-256: 43f63341a3bdf07af2fc380dfadf1197cf6332916735f37c8258b660dd4241cf

126 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF contains embedded JavaScript, including calls to eval() and String.fromCharCode(), indicating obfuscated code execution. The ClamAV detection 'Pdf.Dropper.Agent-7255422-0' strongly suggests a dropper functionality. The extracted JavaScript artifacts, particularly 'acroform_b64_00.js', likely contain the logic for downloading and executing a secondary payload, which is a common attack pattern for malicious PDFs.

Heuristics 6

ClamAV: Pdf.Dropper.Agent-7255422-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-7255422-0
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` `07b6f7217eb2105c6584e36e1b196f45fb340a0d7a5b0575379aa9de279c6038`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6305 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` `2f8b3c0bf07d0c24a3c94c3c6279303d599c666829c166cfe5a5e25deed260b4`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3576 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 4 long base64-like blob(s).

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