PDF malware analysis — malicious · 57e2749a5002d890

MALICIOUS

PDF

71.0 KB Created: 2012-10-02 16:53:23 +04:00 Authoring application: hhrplw (via uwrquxm)

MD5: 2d5340699c5c385e846bc4333e317dbf SHA-1: 63cef38f1f2e7727a5c1e4790b481b727457dfa0 SHA-256: 57e2749a5002d8902ad19c753ddd0cc6f2953ce824b158ff5761016373162682

190 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 User Execution: Malicious Link T1566.002 Phishing: Spearphishing Attachment

The PDF document leverages JavaScript, specifically an AcroForm marker-unescape stager, to exploit CVE-2007-5659. This exploit is designed to download and execute a second-stage payload. The ML classifier strongly indicates maliciousness, and the presence of JavaScript stagers points to a common exploit delivery 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` `87e13082febf1448f9fdb396f6d2bd7667d6c6315cfab9d1fb44b982a9062a5a`	deobfuscated-js	AcroForm field Text3 marker-unescape JavaScript at offset 0x43A	3954 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 6 eval/decoder/string-building token(s).
`javascript_obj0106_000.js` `c404ddb0e804ae77251663ed0ae9a2479181765a5dc4e1c9dfcadb02f937f5f7`	pdf-javascript-stream	PDF /JS object 106 at offset 0x11A48	220 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`javascript_obj0106_001.js` `9d0e8c1be41302aa030f98d5007db561293d8bfa511443810ed2d7df7800cdfc`	pdf-javascript-stream	PDF /JS object 106 at offset 0x11A6C	395 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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