PDF malware analysis — malicious · 3c8a73a5ba7952bc

MALICIOUS

PDF

36.1 KB Created: 2010-02-04 21:56:50 +03:00 Authoring application: firstDuring (via 123ee944824996433ba17e57e8a227c9)

MD5: b954dbeba6cfad3bb4836bbefee9656f SHA-1: cd59e2641ad7a9ff0cb251440494865681ea8539 SHA-256: 3c8a73a5ba7952bc28b3ef9dbcec8a8959dca9e116bfd74666ec0168bba7fca1

164 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' and 'PDF_JS'. A critical heuristic 'ML_NYX_PDF_MALICIOUS' and ClamAV detection ('Pdf.Dropper.Agent-7251944-0') confirm its malicious nature. The presence of an 'eval()' call within the JavaScript stream suggests code execution, likely to download and run a secondary payload. The extracted artifact 'javascript_obj0026_001.js' is also flagged as suspicious.

Machine Learning

Nyx PDF Classifier malicious score 0.9913

Heuristics 7

ClamAV: Pdf.Dropper.Agent-7251944-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-7251944-0
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.
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.
ASCII85Decode filter (with exploit indicators) low PDF_FILTER_85

ASCII85 encoding filter present alongside exploit delivery indicators — uncommon outside of obfuscation
Optional Content Group with action trigger low PDF_OPTIONAL_CONTENT

Optional Content Group (layer) co-occurs with an action trigger — content can be selectively hidden from viewers or scanners while the action still fires on open
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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0024_000.js` `050ff298557b2e75ad4b47f8510cb8f7a50cb31dce92bf7511e426e518eb2df8`	pdf-javascript-stream	PDF /JS object 24 at offset 0x2F0C	34418 bytes
`javascript_obj0026_001.js` `5b884a682f0d916201621ea5a7178a2e1f4b64a46f9b2a7bea984f26f2d6f802`	pdf-javascript-stream	PDF /JS object 26 at offset 0x851F	1367 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

Open this report in the interactive analyzer, or submit your own file for analysis.