PDF malware analysis — malicious · 953ddcd890826fcd

MALICIOUS

PDF

8.4 KB

MD5: 3a0c92adca68df949ee512b98fd1a563 SHA-1: 30165c743a09411da334847e99369f33c3760867 SHA-256: 953ddcd890826fcd01f2a05d638f108c249c48d657e8b994c8dc3d8fc92852c9

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL. The JavaScript stream, specifically stream_003_off00000b82.js, appears to be obfuscated and uses eval() and String.fromCharCode, suggesting it's designed to download and execute a second-stage payload. The benign URLs extracted do not provide further clues, and the document body is unreadable. The primary indicators point to a malicious PDF leveraging JavaScript for exploitation.

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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`stream_002_off0000032d.bin` `102020938c866a987f14e35da7754af70ff3447735a06a87af1e4ff7e860b327`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x32D	3248 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`stream_003_off00000b82.js` `0b91f4637c03aae339c3fd3dfb790ff5940dcf64da2d853d2f35d9c59292c8d6`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0xB82	258 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`objstm_0025_00.bin` `40e8dab100a750defa1001cb0e1bf4ff655fb115cba059fe61c8d62e14b35568`	pdf-objstm-decoded	PDF /ObjStm 25 0 obj (inflated)	432 bytes

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