Pdf.Dropper.Agent PDF malware analysis — malicious · b020e8862bf9f5ea

MALICIOUS

PDF

4.1 KB

MD5: 7bc018807abb2b631b98bf6e295f28df SHA-1: 0e0988e0212db787f183487dd36aef82ddaa28a2 SHA-256: b020e8862bf9f5ead16e7321dacad8487999beceb355fa6129c337d46504ceff

126 Risk Score

Malware Insights

Pdf.Dropper.Agent · confidence 95%

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF contains embedded JavaScript, including a stream with an eval() call and String.fromCharCode usage, indicating obfuscated code execution. The ClamAV heuristic identifies it as 'Pdf.Dropper.Agent-5343109-0', suggesting its purpose is to drop and execute further malware. The extracted JavaScript files, particularly 'acroform_b64_00.js', likely contain the logic for downloading and executing the secondary payload, which is characteristic of a dropper attack pattern.

Heuristics 6

ClamAV: Pdf.Dropper.Agent-5343109-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-5343109-0
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` `4b38b6143de6dad26d9b8ef738fb1283855cf0a4502131d7c974c115f66d3748`	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` `4d1b49ac3909bc464cb690d889a6d8ea2be197d6f31aae3114c65d1167f92162`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3599 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 5 long base64-like blob(s).

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