PDF malware analysis — malicious · 138cf08f525f32a4

MALICIOUS

PDF

459.5 KB Created: 2010-04-21 00:46:53 +08:00

MD5: 0d691640690ef4106340b08ed70aecaf SHA-1: 270416da9b56534e39ee88152cb8d98a51f82296 SHA-256: 138cf08f525f32a42e1f3dab16ca60b6d082b28bcdccf73bffc800d4668d934b

260 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, flagged by multiple heuristics including PDF_JAVASCRIPT and PDF_JS_EXPLOIT_CLUSTER. The presence of unescape() calls and a high ML_NYX_PDF_MALICIOUS score, along with ClamAV detection as Pdf.Exploit.Agent-35956, strongly indicates it's designed to exploit vulnerabilities. The JavaScript is likely used to download and execute a second-stage payload, a common technique for initial compromise.

Machine Learning

Nyx PDF Classifier malicious score 0.6617

Heuristics 10

PDF JavaScript exploit cluster critical PDF_JS_EXPLOIT_CLUSTER

PDF combines an executable JavaScript/action surface with exploit staging indicators such as eval/unescape/fromCharCode, XFA script content, or a related CVE pattern. Benign form JavaScript remains low-severity, but this correlated cluster is high-confidence malicious behavior.
ClamAV: Pdf.Exploit.Agent-35956 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-35956
RichMedia (Flash) high PDF_RICHMEDIA

PDF contains /RichMedia (Adobe Flash) which is a historic exploit vector (matched inside decoded stream)
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. (matched inside decoded stream)
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. (matched inside decoded stream)
Embedded file low PDF_EMBEDDED

PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload (matched inside decoded stream)
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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`stream_002_off00000339.bin` `67a7cb1912625c171e5d00415796d40a3acc714fd8e9ce92d055ecad9bbafc31`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x339	2220 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`objstm_0015_00.bin` `0bea2f3f6742827130b057b701b07bdcb51c89b49c3509980c44a0392473f8fb`	pdf-objstm-decoded	PDF /ObjStm 15 0 obj (inflated)	888 bytes

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