PDF malware analysis — malicious · d703c3ac00125855

MALICIOUS

PDF

50.3 KB Authoring application: gr3PwT0KOh2RLtX5vze%IQuqksHMNZm9AU78nWEfjai41bYVSdFxlpc6DoJGCBy

MD5: 0c53228e1255e699bc2b3a0de5be29f5 SHA-1: 5d6af4bcf1ea8040c8f6969f5ca9fef0be65e5f8 SHA-256: d703c3ac0012585517c70b2f72b34a21c87b301a1a64b6b35bd52d321d3d69ed

90 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT and PDF_JS. The ML classifier strongly flagged this PDF as malicious. The embedded JavaScript stream, named 'javascript_obj0018_000.js', likely contains obfuscated code that is intended to download and execute a second-stage payload. The presence of unescape() calls further suggests code obfuscation typical of malicious JavaScript.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 5

unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits (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.
PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED

The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PSEOF. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
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_obj0018_000.js` `fff1416724c5ac2073f7770da58f023d6566643a7181518beb60e868958bcb50`	pdf-javascript-stream	PDF /JS object 18 at offset 0x4BA	25249 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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