PDF malware analysis — malicious · 50a18cbbb92102af

MALICIOUS

PDF

68.2 KB Created: 2012-10-02 16:53:23 +04:00 Authoring application: hogfeiu (via mstxgsk)

MD5: 22676607999b02f69bd6fbee50b534c6 SHA-1: 805b15e219dab3c0fbc320474e7b8ef4969909f8 SHA-256: 50a18cbbb92102afde766435262943041dda0000bbf9a9741be3b81c755a3381

194 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

This PDF document exploits CVE-2007-5659 by leveraging a JavaScript stager embedded within an AcroForm field. The stager uses unescape() to deobfuscate and execute a payload, likely for information collection or further exploitation. The ML classifier strongly indicates maliciousness, and the presence of JavaScript actions and streams confirms the exploit vector.

Machine Learning

Nyx PDF Classifier malicious score 0.9995

Heuristics 9

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.
PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED

The cross-check parser (pdfminer.six) failed on this file: PDF differential parser exited 1. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
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` `b04c45e2ec453f206afcb36d8f1946b5c1ed830bc419c1a3afa686ec42d2d57b`	deobfuscated-js	AcroForm field Text3 marker-unescape JavaScript at offset 0x416	3792 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 6 eval/decoder/string-building token(s).
`javascript_obj0106_000.js` `4d66b7df8b499a23e11f6bb5732377779c6d7ea24ca19feb87e5565052c331dd`	pdf-javascript-stream	PDF /JS object 106 at offset 0x10F1F	203 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`javascript_obj0106_001.js` `48b5c1aa0b9f3e92a23c6cea25235a186c4aa66d5e158a40d6ff26f2a0e8c10f`	pdf-javascript-stream	PDF /JS object 106 at offset 0x10F40	364 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

Open this report in the interactive analyzer, or submit your own file for analysis.