PDF malware analysis — malicious · d59d98906348e9ab

MALICIOUS

PDF

29.3 KB

MD5: 37602fc46a6ac0f2d9c586c923616e12 SHA-1: f1b1e56340d37ccd1a29aae49d48c120178fd777 SHA-256: d59d98906348e9ab7aae653ea10b9265451297ae87ab87ecfeee29c4ef8aacc6

304 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1566.002 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Exploit.Agent-36098 and contains embedded JavaScript and a Flash object. The embedded JavaScript stream, specifically the legacy_pdfkit_stage_000.js file, utilizes eval() and unescape() functions, indicating potential obfuscation and execution of malicious code. This suggests the PDF is designed to exploit vulnerabilities or download further malicious content.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 10

ClamAV: Pdf.Exploit.Agent-36098 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-36098
ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV

ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
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 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 0xC2B	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 0x82F	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` `72fa89f8f8b9f24f2a21c32681a7bfec32336644cebb49e7e43ebd1b63053396`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x64	3464 bytes

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