PDF malware analysis — malicious · c52e47f7cdf0d843

MALICIOUS

PDF

8.3 KB

MD5: f7999980cfee0bc21ce0a033261ba521 SHA-1: b6c04dd0a02c4d892f13868893847a0604077048 SHA-256: c52e47f7cdf0d8430e76a21a8b1934f17aff467c5bd5b6740d824b78863c465c

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT and PDF_JS. The presence of PDF_EVAL and PDF_FROMCHARCODE suggests obfuscated JavaScript code is being executed. The ML classifier also flagged this PDF as malicious. While no specific URLs or file hashes were extracted, the techniques used point to a downloader or exploit delivery mechanism. No document body text was available for analysis.

Machine Learning

Nyx PDF Classifier malicious score 0.9224

Heuristics 6

eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (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. (matched inside decoded stream)
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. (matched inside decoded stream)
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.
Embedded URL info EMBEDDED_URL

One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
URL http://www.w3.org/1999/02/22-rdf-syntax-ns#
- http://ns.adobe.com/xap/1.0/
- http://purl.org/dc/elements/1.1/
- http://ns.adobe.com/xap/1.0/mm/
- http://ns.adobe.com/pdf/1.3/

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`stream_002_off00000328.bin` `102020938c866a987f14e35da7754af70ff3447735a06a87af1e4ff7e860b327`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x328	3248 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`objstm_0024_00.bin` `79032f11ce34f427db8a5b6d12324f936d972068db1ceaa9d8830ba39e98455d`	pdf-objstm-decoded	PDF /ObjStm 24 0 obj (inflated)	670 bytes

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