PDF malware analysis — malicious · 8544a9fea5b13ca9

MALICIOUS

PDF

343.4 KB Created: 2012-02-11 08:21:56 Authoring application: FPDF 1.52

MD5: 0fc077efef184ba79838c17bf4b89c6c SHA-1: 12b1b00193e04954a98d792fab92bb956ce271ef SHA-256: 8544a9fea5b13ca942c3bec548626ca588186d69fd584ac12871b452b4c95759

130 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript that attempts to redirect the user to an external resource via the 'index.php' link. The presence of a mailto link also suggests a potential phishing or social engineering attempt. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

Nyx PDF Classifier malicious score 0.6252

Heuristics 6

ClamAV: Pdf.Dropper.Agent-7596784-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-7596784-0
Embedded script payload in PDF stream medium PDF_EMBEDDED_SCRIPT_PAYLOAD

PDF stream bytes contain an HTML/XFA <script> tag without accompanying Windows shell-execution primitives — common in accessible XFA forms but worth surfacing for analyst review.
String.fromCharCode low PDF_FROMCHARCODE

String.fromCharCode found — used to construct payload strings dynamically. Common in benign JavaScript libraries for codepoint manipulation, so this alone is informational; weaponised use is also caught by the dedicated fromCharCode-stage and exploit-shape rules.
External URI low PDF_URI

PDF contains an external URL action
PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED

The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PSSyntaxError. 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.

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`embedded_pdf_script_000554b6.bin` `efc4ce8213790672f2e0e0366187e2e514bed2a37283db1e30b26b6540870a17`	pdf-embedded-script	PDF decompressed stream script payload at offset 0x554B6	351566 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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