PDF malware analysis — malicious · da846bbf248d13e8

MALICIOUS

PDF

4.1 KB

MD5: 3da6a97dc9c23ce00a46626e57facb84 SHA-1: 3563f38306a11e1f3a2ad45b21276bcab6046c44 SHA-256: da846bbf248d13e8cdfa23195503f5f3fb176c6ab93e830d17e881c734c7b5a3

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 name 'Pdf.Dropper.Agent-7311720-0' strongly suggests its function as a dropper. The extracted JavaScript files, particularly 'acroform_b64_00.js', likely contain the logic for downloading and executing a secondary payload, which is a common dropper behavior.

Heuristics 6

ClamAV: Pdf.Dropper.Agent-7311720-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-7311720-0
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` `1fa321098279d6a09cd539497dd551efb2ce2dd604f3f613b0e25205a3cc1868`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6433 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` `97d72972ec918cf293efde8d099a1b33646cc0fac8f9e1f1080ba7f1b10999d8`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3671 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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