PDF malware analysis — malicious · 7008da8d0b06a10d

MALICIOUS

PDF

21.1 KB

MD5: 04a05ed908ebc2be703c9a08def8a6b5 SHA-1: 3f5890391436c3f074a13d003fbdd54185f2b779 SHA-256: 7008da8d0b06a10d1e88444afc2d4d01b14d6f6f7a9de5995555e952882f1efb

90 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript

The PDF contains embedded JavaScript that is obfuscated but clearly attempts to download a payload from the URL http://cheapmobilesex.com/new/post.php?e=8&&. The ML classifier strongly indicates maliciousness, and the embedded URL is a high-confidence indicator of a downloader or droppper functionality.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

Heuristics 5

PDF JavaScript shellcode contains an embedded download URL high PDF_JS_SHELLCODE_DOWNLOAD_URL

Decoded PDF JavaScript shellcode contains a hardcoded http(s) URL stored as little-endian %uXXXX Unicode escapes. Reader exploit shellcode embeds the second-stage fetch URL this way and pulls it down with a urlmon/URLDownloadToFile-style download-and-execute (commodity downloader behaviour rather than a specific Acrobat CVE).
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://cheapmobilesex.com/new/post.php?e=8&&

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0008_000.js` `01e9cf5d4d12d35b6e9fec19256894f181448b780d0fff87e991947bed57c07d`	pdf-javascript-stream	PDF /JS object 8 at offset 0x1E7	1735 bytes
`javascript_obj0008_001.js` `ab748c3525d2e3c2c5be214029cea645024202c9bf562bc7ed6cbfd150ddab73`	pdf-javascript-stream	PDF /JS object 8 at offset 0x209	21063 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).
`legacy_pdfkit_stage_000.js` `f9e12b51a2c231d07832ca39782442ee6097a436c8a723cf509913e0200d8113`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x8E2	1268 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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