PDF malware analysis — malicious · b48b51f1a5d18b59

MALICIOUS

PDF

4.0 KB

MD5: f0c2adea0763fcb103dfb755df66e0cd SHA-1: ad62400db0144bad8f38e62a7cae059a20820511 SHA-256: b48b51f1a5d18b594183b0ab480e71f8bebf0ec3bebc770b21610cde52755046

136 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains multiple indicators of malicious activity, including embedded JavaScript, JBIG2 decoding with active content, and ASCIIHexDecode filters, all flagged by high-severity heuristics. The ML classifier also strongly indicates maliciousness. While the document body is unreadable, the presence of embedded JavaScript suggests an attempt to exploit vulnerabilities or deliver a secondary payload. No specific family could be identified.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

Heuristics 7

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.
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` `d88690d856e41632cc771ccc7a0a53e072869aeb7ba9ecd027feda6a9f2846aa`	pdf-javascript-stream	PDF /JS object 5 at offset 0x10D	19612 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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