PDF malware analysis — malicious · fa1ed9ebfecb72dd

MALICIOUS

PDF

29.3 KB

MD5: 1fdce36217594815815401ba5ac0ba9a SHA-1: a9768ed021dc3f1fc3f3908ebb3bfd8ead56ea5f SHA-256: fa1ed9ebfecb72ddf1ff5f3b4b1c49b9097493a82a65f7e09f4a955f20ce0ed6

304 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

This PDF file contains embedded JavaScript that utilizes `eval()` and `unescape()` functions, indicating obfuscated code execution. The ML classifier and ClamAV detections strongly suggest malicious intent. The embedded JavaScript likely loads and executes the embedded SWF (Flash) file, which is a common technique for delivering further malicious payloads or exploits. The presence of multiple ClamAV detections on the PDF and its extracted artifacts reinforces the malicious nature of this file.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 9

ClamAV: Pdf.Exploit.Agent-36098 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-36098
RichMedia (Flash) high PDF_RICHMEDIA

PDF contains /RichMedia (Adobe Flash) which is a historic exploit vector
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits (matched inside decoded stream)
JavaScript action low 1 related finding 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.
Embedded file low PDF_EMBEDDED

PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload
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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`SWFNAME.swf` `a98024b4ee1377e872e3ebaf1c361600c270db5fd5ba79f256106c0c566dde29`	pdf-embedded-file	PDF EmbeddedFile object 16 at offset 0xC2D	26777 bytes
Detection ClamAV: Pdf.Exploit.Agent-35955 Obfuscation or payload: likely Carved artifact entropy is 7.99, consistent with packed or encrypted content.
`javascript_obj0006_000.js` `e1ab3bbf30605cecdce6db9d2556198626dbb178f7a4cb471a9436bb6e8bd92f`	pdf-javascript-stream	PDF /JS object 6 at offset 0x831	462 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_000.js` `18f2207986894acb6a20a66b7eec04ce25e0ae7dfa431304b0d0105c4464010e`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x64	3470 bytes

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