PDF malware analysis — malicious · 0f3a849f5eff18b0

MALICIOUS

PDF

8.2 KB Created: 2008-31-20 53:85:00 Authoring application: Scribus 1.3.3.12 (via Scribus PDF Library 1.3.3.12)

MD5: 36fdcf1e91b3a7d7f8a3ae54e07ccad3 SHA-1: b752e869f1b0f7a7e26ee0f230f6a4445572aa62 SHA-256: 0f3a849f5eff18b03f47e3b3dd9619a067f0bb269452b2ecafcad60225e85472

310 Risk Score

Malware Insights

MITRE ATT&CK

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

This PDF file contains obfuscated JavaScript that utilizes eval() and unescape() functions, indicative of exploit code. The script attempts to download and execute a second-stage payload from the embedded URLs. The ML classifier and ClamAV detection strongly support its malicious nature, classifying it as a PDF exploit.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 9

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-35587 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-35587
ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV

ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution
unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits
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.
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://max.gunggo.com/show_ad.ashx?type=pop&sid=2373&cid=2590&cm=1&fc=4&hr=24&cb=
- http://ads.doclix.com/adserver/serve/js/doclix_synd_overlay.js
- http://max.gunggo.com/show_ad.ashx?type=pop&sid=2373&cid=2590&cm=1&fc=4&hr=24&cb='+cache_buster+

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0013_001.js` `88ec511384fcb51e9f40f2874415e6ce652c618f92039a5d7d6cc7d358ce7213`	pdf-javascript-stream	PDF /JS object 13 at offset 0x3D7	5879 bytes
Detection ClamAV: Pdf.Exploit.Agent-35587 Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).
`javascript_obj0013_002.js` `5267f98c92097a203500296442bdd047622bd5194b6f94139cbda2abb56c820f`	pdf-javascript-stream	PDF /JS object 13 at offset 0x3FD	7365 bytes
Detection ClamAV: Pdf.Exploit.Agent-35587 Obfuscation or payload: likely Carved artifact contains 6 eval/decoder/string-building token(s).

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