PDF malware analysis — malicious · 935ea344653e5fc7

MALICIOUS

PDF

242.9 KB Created: 2018-09-06 21:28:40 Authoring application: Joomla! 1.5 - Open Source Content Management (via TCPDF 2.5.000_PHP4 (http://www.tcpdf.org))

MD5: b9f12de69755c9a83d9e301f07913de3 SHA-1: 068c8244f998d0dc5c6fc7fc32b9ae776efbe4e0 SHA-256: 935ea344653e5fc7c3f66e1e9dc73e936274aed0cc075291dfecd67fd14a399b

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 contained an embedded script payload. The script is likely responsible for downloading and executing a second-stage payload, as indicated by the heuristic 'PDF_EMBEDDED_SCRIPT_PAYLOAD'. The presence of 'String.fromCharCode' suggests obfuscation techniques were employed within the script.

Machine Learning

Nyx PDF Classifier malicious score 0.9247

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_003_off0000cace.bin` `a5337ef1f5a0dfe4dc8fa6b4f3ef847a53624800b5928a0eeef5b888ceecaabc`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0xCACE	264072 bytes
`embedded_pdf_script_0003bca4.bin` `1bc4681a2eff6a7e7367ec3ee16b944d8c8129433940bccee2680c6f0ccca401`	pdf-embedded-script	PDF decompressed stream script payload at offset 0x3BCA4	248755 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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