Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c6a5fe7e60d6744…

MALICIOUS

PDF

169.8 KB
MD5: 8ceba988edbef0d3bc60dfcf8b9540c6 SHA-1: 038c604cc3c6939fe5d13eb82ee6a85c2012c20b SHA-256: 2c6a5fe7e60d6744ca1b014c929ca85bbc08a879b95bb318ceab445439d8fd59
100 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1566.001 Spearphishing Attachment T1140 Deobfuscate/Decode Files or Information

The PDF file exhibits multiple signs of malicious intent, including embedded scripts and an embedded file artifact. The ClamAV detection for 'Heuristics.PDF.ObfuscatedNameObject' and the 'PDF_EMBEDDED_SCRIPT_PAYLOAD' heuristic strongly indicate that the document is designed to conceal and deliver a malicious payload. The presence of an embedded file, 'embedded_file_obj0001.bin', further supports this, as it is likely the secondary stage of the attack.

Heuristics 6

  • ClamAV: Heuristics.PDF.ObfuscatedNameObject critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Heuristics.PDF.ObfuscatedNameObject
  • 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.
  • Embedded file low PDF_EMBEDDED
    PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload
  • XFA form low PDF_XFA
    PDF uses XML Forms Architecture — can contain script logic
  • 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.

FilenameKindSourceSize
embedded_file_obj0001.bin
8eef57372c04e1368e4f26443e22977fe9a571efbc0d8eac3a86444ebf4bcbab
pdf-embedded-file PDF EmbeddedFile object 1 at offset 0x29D3F 14677 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 long base64-like blob(s).