PDF malware analysis — malicious · bbb25dfef3431ad9

MALICIOUS

PDF

80.2 KB

MD5: ce62a93668eeabf932d5d49e851ae176 SHA-1: 465e71653ee012b45120d8f33d219a1456153424 SHA-256: bbb25dfef3431ad9d06c983b29c887e9ed081003fc102152afe4b01416f7cffb

68 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1566.002 Spearphishing Attachment T1204.002 Malicious File

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, named 'javascript_obj0012_000.js', is likely responsible for downloading and executing a second-stage payload from the embedded URL, http://www.bitstream.com.

Machine Learning

Nyx PDF Classifier malicious score 0.9994

Heuristics 5

ASCIIHexDecode filter (with exploit indicators) medium PDF_FILTER_HEX

Hex-encoding filter present alongside exploit delivery indicators — often used to hide payload or shellcode bytes
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.
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.bitstream.com

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0012_000.js` `01a0adccefd7d591c08f34425f8685878c24fc362e2348fd278a9edba098495d`	pdf-javascript-stream	PDF /JS object 12 at offset 0x104F0	3742 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`font_00_sfnt_off00000319.bin` `67cf5b115c479e7cc69ef02607414d718125a1e117a59d537db3e97682d5b723`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x319	65932 bytes

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