PDF malware analysis — malicious · 74410bbf25f77f06

MALICIOUS

PDF

299.2 KB Created: 2017-12-02 06:35:27 Authoring application: Joomla! 1.5 - Open Source Content Management (via TCPDF 2.5.000_PHP4 (http://www.tcpdf.org))

MD5: a29b8b7e4d357837ceef786e3555c67c SHA-1: c9e5bd34a9baa64641a5de08dbc56ba6a9054099 SHA-256: 74410bbf25f77f068b385226a12e945a0d08d706a0f049be3b7dde6c1569e412

92 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, indicated by the 'PDF_EMBEDDED_SCRIPT_PAYLOAD' heuristic and the presence of a script stream. This script is likely designed to download and execute a second-stage payload, a common technique for malware delivery. The ClamAV detection 'Pdf.Dropper.Agent-7272970-0' further confirms its malicious nature as a dropper.

Machine Learning

Nyx PDF Classifier clean score 0.1248

Heuristics 5

ClamAV: Pdf.Dropper.Agent-7272970-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-7272970-0
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.
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.gnu.org/copyleft/gpl.html

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`stream_004_off0000c1fd.bin` `a5337ef1f5a0dfe4dc8fa6b4f3ef847a53624800b5928a0eeef5b888ceecaabc`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0xC1FD	264072 bytes
`embedded_pdf_script_00049dc5.bin` `99476e8f56bef2c9e7cb58c54384dd168b971fbd8eecd6f67d86a645b433addd`	pdf-embedded-script	PDF decompressed stream script payload at offset 0x49DC5	306388 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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