PDF malware analysis — malicious · 7df485c18237f2c8

MALICIOUS

PDF

68.0 KB Created: 2012-10-02 16:53:23 +04:00 Authoring application: jtnrwtu (via hldrn)

MD5: fa0daf08cb26ef58aba76ae5296afa11 SHA-1: e03d178183c23a47ab308b773dcee34db5828e74 SHA-256: 7df485c18237f2c88d24e03cba8fdd2eb32e3b9702b715c6c4e61d9f8ec7873b

190 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

This PDF document contains a JavaScript stager within an AcroForm field that leverages the CVE-2007-5659 vulnerability. The stager is designed to unescape and execute obfuscated JavaScript, which is then likely used to download and execute a second-stage payload. The ML classifier strongly indicates maliciousness, and the presence of the AcroForm marker-unescape JavaScript stager points to a known exploit technique.

Machine Learning

Nyx PDF Classifier malicious score 0.9995

Heuristics 8

Collab.collectEmailInfo — CVE-2007-5659 critical CVE exact CVE_2007_5659

PDF JavaScript calls Collab.collectEmailInfo — CVE-2007-5659 is a buffer overflow in Adobe Reader triggered by a long argument or heap-sprayed message field passed to Collab.collectEmailInfo(). Part of a series of Acrobat JS API exploits. (identified after JavaScript deobfuscation)
unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits
AcroForm marker-unescape JavaScript stager high PDF_ACROFORM_MARKER_UNESCAPE_JS_STAGER

PDF OpenAction JavaScript reads an AcroForm field value, rewrites a long marker token back to percent escapes, then unescape/eval executes the recovered exploit stage.
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 paints image(s) but contains no text operators info PDF_IMAGE_ONLY_LURE

PDF has 1 image XObject(s) and the content stream contains no text-emitting operators (BT/ET, Tj, TJ, ', ") in either raw bytes or decompressed streams — this is the screenshot-as-PDF pattern used to bypass text-based scanners and to deliver instructions purely through rendered pixels. It is informational unless paired with invisible links or risky URI context.
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.w3.org/1999/02/22-rdf-syntax-ns#
- http://ns.adobe.com/xap/1.0/
- http://purl.org/dc/elements/1.1/
- http://ns.adobe.com/xap/1.0/mm/
- http://ns.adobe.com/pdf/1.3/

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`acroform_marker_stage_000.js` `a1ea0dd129221d68447a18ec5c9d3360ac7d50a5ebb53ebb718c5c834a27144b`	deobfuscated-js	AcroForm field Text3 marker-unescape JavaScript at offset 0x416	3780 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 6 eval/decoder/string-building token(s).
`javascript_obj0106_000.js` `7034d1c8f7126a28d6716e5938c0187fdcf4ffb2d797fa4b15e8f9ed4a7055d4`	pdf-javascript-stream	PDF /JS object 106 at offset 0x10E53	207 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`javascript_obj0106_001.js` `258afd0becc50cd3bce29daadf5643c0698b845b4b09f08a05ba548ebe0d726e`	pdf-javascript-stream	PDF /JS object 106 at offset 0x10E74	368 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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