PDF / .PHP malware analysis — malicious · 083a2dc875013dcf

MALICIOUS

PDF / .PHP

5.8 KB Created: 2008-09-24 19:47:56 Authoring application: Adobe (via Notepad)

MD5: 352450ef5ecf863214997c5543ad67fe SHA-1: e0548a87b4ffa89f8295aa62c2a56f786b90d7be SHA-256: 083a2dc875013dcf9d10a108ae69bc9f303376563cd9cce8f54bb7d2f7a52729

90 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains embedded JavaScript, identified by multiple heuristics, which is designed to download a second-stage payload from the URL http://illegaloffer.ru/forum/load.php?spl=pdf_exp. The JavaScript code itself appears to be obfuscated but contains shellcode and the download URL. The ML classifier strongly indicates maliciousness.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

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://illegaloffer.ru/forum/load.php?spl=pdf_exp

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`legacy_pdfkit_stage_000.js` `db030c6558d3c5af34b9d0165d0dd54414a468aae44ff03e74f6a639350f70af`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x18D	1062 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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