PDF malware analysis — malicious · 8fef8e403a5250aa

MALICIOUS

PDF

99.5 KB Created: 2008-03-03 17:06:20 +08:00 Authoring application: PScript5.dll Version 5.2 (via Acrobat Distiller 6.0.1 (Windows))

MD5: ee78ba7d15e5d7e9e2049426af6dbe3c SHA-1: 358af60869dac12a9802a8bf1b4400a7a9e3b211 SHA-256: 8fef8e403a5250aa9240efb619cd58a6ef8a30f9a064b2db2cbacee250a61240

230 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript that utilizes the unescape function and targets CVE-2007-5659 (Collab.collectEmailInfo). This indicates the script is designed to download and execute a second-stage payload. The ML classifier and ClamAV detection strongly support this malicious intent. No specific family could be identified, but the delivery mechanism is clear.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

Heuristics 11

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. (matched in decompressed stream)
ClamAV: Win.Trojan.Dropper-82 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Win.Trojan.Dropper-82
unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits (matched inside decoded stream)
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.
Embedded file low PDF_EMBEDDED

PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload
XFA form low PDF_XFA

PDF uses XML Forms Architecture — can contain script logic
Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL

The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED

The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PermissionError. 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/xhtml
- http://www.xfa.org/schema/xfa-data/1.0/
- http://www.w3.org/1999/02/22-rdf-syntax-ns#
- http://ns.adobe.com/pdf/1.3/
- http://ns.adobe.com/xap/1.0/
- http://ns.adobe.com/xap/1.0/mm/
- http://purl.org/dc/elements/1.1/

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0035_000.js` `03574e1d20835705dbdbe0505985a8472366bec2262ccb79f03184e327e7082a`	pdf-javascript-stream	PDF /JS object 35 at offset 0x1781B	5283 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 16 eval/decoder/string-building token(s).

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