PDF malware analysis — malicious · ff882814c557be4d

MALICIOUS

PDF

7.8 KB Created: 2009-10-31 19:47:23 Authoring application: PDF Library 4.2.3 (via PDF Library 4.3.8)

MD5: 9b55efa4145dfd8d248c19a15ddf9d85 SHA-1: 2309d192c5ab8d8e83ab8e4f1bacf3dcb4c74e3f SHA-256: ff882814c557be4d754abae06f15a5effb946cd8d27ec08fdc2ca7a5c2f84f7a

146 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file was flagged as malicious by multiple engines, including ClamAV which identified it as 'Pdf.Dropper.Agent-7329339-0'. Static analysis revealed embedded JavaScript and the use of ASCIIHexDecode filters, indicating obfuscation techniques common in malware delivery. The ML classifier also strongly indicated maliciousness. The primary attack pattern involves exploiting PDF vulnerabilities to execute a malicious JavaScript payload, likely to download and run a second-stage exploit or malware.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 5

ClamAV: Pdf.Dropper.Agent-7329339-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-7329339-0
ASCIIHexDecode filter (with exploit indicators) medium PDF_FILTER_HEX

Hex-encoding filter present alongside exploit delivery indicators — often used to hide payload or shellcode bytes
Suspicious extracted artifact medium 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.
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.

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0007_000.js` `d1d47bf993621a429ae8e71f14cce338d87d726e059d023cbefad5637c9a0250`	pdf-javascript-stream	PDF /JS object 7 at offset 0x268	37449 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long hex-escaped blob(s).

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