PDF malware analysis — malicious · bf7105928823dfd9

MALICIOUS

PDF

2.9 KB

MD5: 8fa5ab07fbeb1bc53f0aed89d135c2ab SHA-1: 33265ccf1adeeb5f1b99fce5eddaec57e2858845 SHA-256: bf7105928823dfd93ace00c390a478ed33e1fb4dad7566b1cfe40808aea63073

86 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file exhibits multiple heuristic firings related to JavaScript, including embedded JS streams and the use of String.fromCharCode for obfuscation. ClamAV identifies this as 'Pdf.Dropper.Agent-7685821-0', indicating a dropper functionality. The presence of obfuscated JavaScript suggests an attempt to download and execute a second-stage payload, which is a common characteristic of droppers.

Heuristics 5

ClamAV: Pdf.Dropper.Agent-7685821-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-7685821-0
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 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0009_000.js` `2b475b247ac2d9d5d090abe9453f08cd2c1772d434bfefe32e6470afd707873d`	pdf-javascript-stream	PDF /JS object 9 at offset 0xD6	19809 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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