PDF malware analysis — malicious · d32a29fadcabbe88

MALICIOUS

PDF

238.1 KB Created: 2017-12-03 11:25:23 Authoring application: Joomla! 1.5 - Open Source Content Management (via TCPDF 2.5.000_PHP4 (http://www.tcpdf.org))

MD5: b9f86dd6d493c57554624af79e40a606 SHA-1: e5d4cf85fe0ba892752c2447f319f7605887435d SHA-256: d32a29fadcabbe885c967cf569e95166434bb25b893529cb00a2b285f504ea21

60 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF was flagged by a machine learning classifier as malicious and contains an embedded script payload. The heuristic 'PDF_EMBEDDED_SCRIPT_PAYLOAD' indicates that this script is likely intended to be executed, potentially leading to further malicious activity. The presence of 'String.fromCharCode' suggests obfuscation within the script. The ML classifier's high score further supports the malicious nature of the document.

Machine Learning

Nyx PDF Classifier malicious score 0.9504

Heuristics 3

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.

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`stream_002_off0000b783.bin` `a5337ef1f5a0dfe4dc8fa6b4f3ef847a53624800b5928a0eeef5b888ceecaabc`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0xB783	264072 bytes
`embedded_pdf_script_0003a937.bin` `3360ada80471701100de45343dd6bd825503114846bcb5dcb3aaada9f014590c`	pdf-embedded-script	PDF decompressed stream script payload at offset 0x3A937	243782 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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