PDF malware analysis — malicious · bb557f52f75fdf12

MALICIOUS

PDF

15.9 KB

MD5: 3fe1bce51ef090bc56f79da87ee942e0 SHA-1: f00f4d295e274743c1c600e0d7335d65d4a7f200 SHA-256: bb557f52f75fdf121ef74b81f489e745f2c6b652b8d0fa3f2af1269c880492b7

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The JavaScript stream includes eval() calls and String.fromCharCode, suggesting obfuscation. The deobfuscated JavaScript (legacy_pdfkit_stage_000.js) is extensive and likely responsible for downloading and executing a secondary payload. The extracted filenames also serve as IOCs.

Heuristics 5

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.
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.

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0004_000.js` `8839888c0d020faee36698da69607c2142ae954920a235e0a10c34158a18e5f5`	pdf-javascript-stream	PDF /JS object 4 at offset 0xE1	305 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_000.js` `c31d50a6bfa591c402f2ba6f1540fe12667ade799fc9a481e907d2cccbe8b617`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x1AB3	12224 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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