PDF malware analysis — malicious · faa51a4e93265bad

MALICIOUS

PDF

16.4 KB Authoring application: 3.0.4 (5.0.8)

MD5: f2406ac5774b95505b3d587465b2740d SHA-1: b4b25aaaf07f4678688cefc4344a9f078f5e49b8 SHA-256: faa51a4e93265bad56fa4bcec9bcc968d6d11b0b2b01bc7d82cfee3b324031f6

128 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains embedded JavaScript, identified by heuristics like PDF_JAVASCRIPT and PDF_JS. The ML classifier also flagged it as malicious. The document is structured as an image-only lure, typical of phishing attacks, and contains an external URI pointing to a suspicious blogspot domain. The embedded JavaScript likely facilitates the redirection to this malicious site, aiming to compromise the user.

Machine Learning

Nyx PDF Classifier malicious score 0.7632

Heuristics 6

Embedded script payload in PDF stream high PDF_EMBEDDED_SCRIPT_PAYLOAD

PDF stream bytes contain script execution markers such as ActiveXObject/CreateObject, WScript.Shell, PowerShell, or shell-exec primitives. This is stronger than ordinary PDF JavaScript because it indicates a staged external script payload hidden in stream bytes.
Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE

PDF has 2 image(s), only 0 text block(s), carries a click-outward action, and is only 16 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
Suspicious extracted artifact medium 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.
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)
External URI info PDF_URI

PDF contains an external URL action

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`stream_005_off00003bc1.js` `d6d98f8cc3c656ede5245ecb8dfa2a6da1ea668d48f241ea842bd764ea563535`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x3BC1	2761 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 shell/COM execution token(s).

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