PDF malware analysis — malicious · 957dec3a1e4eef34

MALICIOUS

PDF

8.3 KB

MD5: 4474f8705596f3b14f8e71ba8fc5eb3b SHA-1: 812817c44956d6f6b2b33fd37f420810b27d93e4 SHA-256: 957dec3a1e4eef34d888cc8c0f8cf3c7d1eb36a86da24a7c3b8aade558a33d83

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL. The eval() call within the JavaScript stream suggests code execution. While the specific payload is not directly visible, the presence of obfuscated JavaScript and the PDF context strongly imply an attempt to download and execute a secondary malicious file. The confidence is moderate due to the obfuscation and lack of direct URL evidence in the provided output.

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` `cb1a7bf5bf3f9045a3cdf367a3348e541aa64f9de737ee470fcbf481d11e2cfd`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x32D	3166 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`stream_003_off00000b78.js` `c5ac00eb8af8ed633728ac896e454328fd9ec72c389b5fc50be93ff5546dee66`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0xB78	330 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`objstm_0025_00.bin` `d70c055d9995d1160b66355e579ca43ad3404c7bb805345d3091523f0dc11350`	pdf-objstm-decoded	PDF /ObjStm 25 0 obj (inflated)	375 bytes

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