PDF malware analysis — malicious · 6ad9bf3a94b6db85

MALICIOUS

PDF

7.1 KB

MD5: 2b8f7cc651e49947a39dab72cbb35861 SHA-1: 8fbb724232a6e2ad9f2705bcae7f7ca2ba54f1e7 SHA-256: 6ad9bf3a94b6db8535609eed97e3071320945101e6b13b4e0a7b5b0ca6c0c337

316 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF contains embedded JavaScript that utilizes the unescape function and heap spraying techniques, strongly indicating an exploit for a client-side vulnerability. The presence of an embedded SWF file further suggests a multi-stage attack. The ClamAV detection of Win.Exploit.Fnstenv_mov-1 confirms the malicious nature of the file, likely related to the 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: Win.Exploit.Fnstenv_mov-1 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Win.Exploit.Fnstenv_mov-1
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.
RichMedia (Flash) high PDF_RICHMEDIA

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

PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload
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.

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`exploit.swf` `91c3ef917d291bc80612f8c9fe62da009e69c4e6a4350cc922c65fb59af4ea56`	pdf-embedded-file	PDF EmbeddedFile object 14 at offset 0x48C	3764 bytes
Detection ClamAV: Win.Exploit.Fnstenv_mov-1 Obfuscation or payload: unlikely
`javascript_obj0017_000.js` `8eca89d8ba6e05341cab405be7afbaad22ca6cec35b6077639ff64105a9887c8`	pdf-javascript-stream	PDF /JS object 17 at offset 0x13F4	1674 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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