PDF malware analysis — malicious · 62d4d75956fb2f2e

MALICIOUS

PDF

242.9 KB Created: 2017-11-21 08:57:48 Authoring application: Joomla! 1.5 - Open Source Content Management (via TCPDF 2.5.000_PHP4 (http://www.tcpdf.org))

MD5: 653f180be37d46f47663bfee3d4d1035 SHA-1: ef6a7be80b1fd0b0f5461a62080c5156a6ec3890 SHA-256: 62d4d75956fb2f2ed7c4af6e19cd7a07fae09d424657a000241c0b0ed40c5c64

62 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged as malicious by an ML classifier and contains embedded script content. The presence of PDF-specific heuristics like 'PDF_EMBEDDED_SCRIPT_PAYLOAD' indicates an attempt to execute code within the document. The embedded script, likely JavaScript given the PDF context, is designed to download and execute a second-stage payload, which is a common technique for initial compromise.

Machine Learning

Nyx PDF Classifier malicious score 0.9247

Heuristics 4

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_003_off0000cace.bin` `a5337ef1f5a0dfe4dc8fa6b4f3ef847a53624800b5928a0eeef5b888ceecaabc`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0xCACE	264072 bytes
`embedded_pdf_script_0003bca4.bin` `a145a63a0059d713d85137dd742c60e3279f7cd837bc4c8e8d72883a1acacfe8`	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).

Open this report in the interactive analyzer, or submit your own file for analysis.