PDF malware analysis — malicious · 1fb8cc5c78c5356a

MALICIOUS

PDF

4.4 KB

MD5: 07494a58c255fe5aa53ec2fe4fc3d071 SHA-1: 30f75af53774d92963f918709dc09cd9808be6e7 SHA-256: 1fb8cc5c78c5356a74ecfd0c506852f62dc4293a7c557d88b11d60f0042c780a

176 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1204.002 Malicious File

The PDF contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL. The ML classifier strongly flags this PDF as malicious. The embedded JavaScript stream, named 'javascript_obj0005_000.js', is the primary artifact suggesting the execution of malicious code. The exact intent of the script is not fully discernible due to potential obfuscation, but its presence within an exploited PDF structure points to a downloader or initial execution vector.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

Heuristics 8

JBIG2 + active content high CVE related PDF_JBIG2_ACTIVE_CONTENT

JBIG2Decode appears with JavaScript/XFA/RichMedia — a related indicator for JBIG2 parser-exploit families including CVE-2021-30860 and CVE-2009-0658, but not a unique CVE fingerprint.
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
JBIG2Decode filter medium PDF_JBIG2

JBIG2 image decoder present — historically used in zero-click exploits
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
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_obj0005_000.js` `7654112b9e1b15b4c153e701ebac7741253370716140a5209f03e4c75e23a5e8`	pdf-javascript-stream	PDF /JS object 5 at offset 0x10D	23168 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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